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Commit | Line | Data |
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c21e0bbf MO |
1 | /* |
2 | * CXL Flash Device Driver | |
3 | * | |
4 | * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation | |
5 | * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation | |
6 | * | |
7 | * Copyright (C) 2015 IBM Corporation | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/pci.h> | |
19 | ||
20 | #include <asm/unaligned.h> | |
21 | ||
22 | #include <misc/cxl.h> | |
23 | ||
24 | #include <scsi/scsi_cmnd.h> | |
25 | #include <scsi/scsi_host.h> | |
65be2c79 | 26 | #include <uapi/scsi/cxlflash_ioctl.h> |
c21e0bbf MO |
27 | |
28 | #include "main.h" | |
29 | #include "sislite.h" | |
30 | #include "common.h" | |
31 | ||
32 | MODULE_DESCRIPTION(CXLFLASH_ADAPTER_NAME); | |
33 | MODULE_AUTHOR("Manoj N. Kumar <manoj@linux.vnet.ibm.com>"); | |
34 | MODULE_AUTHOR("Matthew R. Ochs <mrochs@linux.vnet.ibm.com>"); | |
35 | MODULE_LICENSE("GPL"); | |
36 | ||
c21e0bbf MO |
37 | /** |
38 | * process_cmd_err() - command error handler | |
39 | * @cmd: AFU command that experienced the error. | |
40 | * @scp: SCSI command associated with the AFU command in error. | |
41 | * | |
42 | * Translates error bits from AFU command to SCSI command results. | |
43 | */ | |
44 | static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp) | |
45 | { | |
88d33628 MO |
46 | struct afu *afu = cmd->parent; |
47 | struct cxlflash_cfg *cfg = afu->parent; | |
48 | struct device *dev = &cfg->dev->dev; | |
c21e0bbf MO |
49 | struct sisl_ioarcb *ioarcb; |
50 | struct sisl_ioasa *ioasa; | |
8396012f | 51 | u32 resid; |
c21e0bbf MO |
52 | |
53 | if (unlikely(!cmd)) | |
54 | return; | |
55 | ||
56 | ioarcb = &(cmd->rcb); | |
57 | ioasa = &(cmd->sa); | |
58 | ||
59 | if (ioasa->rc.flags & SISL_RC_FLAGS_UNDERRUN) { | |
8396012f MO |
60 | resid = ioasa->resid; |
61 | scsi_set_resid(scp, resid); | |
88d33628 MO |
62 | dev_dbg(dev, "%s: cmd underrun cmd = %p scp = %p, resid = %d\n", |
63 | __func__, cmd, scp, resid); | |
c21e0bbf MO |
64 | } |
65 | ||
66 | if (ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN) { | |
88d33628 MO |
67 | dev_dbg(dev, "%s: cmd underrun cmd = %p scp = %p\n", |
68 | __func__, cmd, scp); | |
c21e0bbf MO |
69 | scp->result = (DID_ERROR << 16); |
70 | } | |
71 | ||
88d33628 MO |
72 | dev_dbg(dev, "%s: cmd failed afu_rc=%02x scsi_rc=%02x fc_rc=%02x " |
73 | "afu_extra=%02x scsi_extra=%02x fc_extra=%02x\n", __func__, | |
74 | ioasa->rc.afu_rc, ioasa->rc.scsi_rc, ioasa->rc.fc_rc, | |
75 | ioasa->afu_extra, ioasa->scsi_extra, ioasa->fc_extra); | |
c21e0bbf MO |
76 | |
77 | if (ioasa->rc.scsi_rc) { | |
78 | /* We have a SCSI status */ | |
79 | if (ioasa->rc.flags & SISL_RC_FLAGS_SENSE_VALID) { | |
80 | memcpy(scp->sense_buffer, ioasa->sense_data, | |
81 | SISL_SENSE_DATA_LEN); | |
82 | scp->result = ioasa->rc.scsi_rc; | |
83 | } else | |
84 | scp->result = ioasa->rc.scsi_rc | (DID_ERROR << 16); | |
85 | } | |
86 | ||
87 | /* | |
88 | * We encountered an error. Set scp->result based on nature | |
89 | * of error. | |
90 | */ | |
91 | if (ioasa->rc.fc_rc) { | |
92 | /* We have an FC status */ | |
93 | switch (ioasa->rc.fc_rc) { | |
94 | case SISL_FC_RC_LINKDOWN: | |
95 | scp->result = (DID_REQUEUE << 16); | |
96 | break; | |
97 | case SISL_FC_RC_RESID: | |
98 | /* This indicates an FCP resid underrun */ | |
99 | if (!(ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN)) { | |
100 | /* If the SISL_RC_FLAGS_OVERRUN flag was set, | |
101 | * then we will handle this error else where. | |
102 | * If not then we must handle it here. | |
8396012f | 103 | * This is probably an AFU bug. |
c21e0bbf MO |
104 | */ |
105 | scp->result = (DID_ERROR << 16); | |
106 | } | |
107 | break; | |
108 | case SISL_FC_RC_RESIDERR: | |
109 | /* Resid mismatch between adapter and device */ | |
110 | case SISL_FC_RC_TGTABORT: | |
111 | case SISL_FC_RC_ABORTOK: | |
112 | case SISL_FC_RC_ABORTFAIL: | |
113 | case SISL_FC_RC_NOLOGI: | |
114 | case SISL_FC_RC_ABORTPEND: | |
115 | case SISL_FC_RC_WRABORTPEND: | |
116 | case SISL_FC_RC_NOEXP: | |
117 | case SISL_FC_RC_INUSE: | |
118 | scp->result = (DID_ERROR << 16); | |
119 | break; | |
120 | } | |
121 | } | |
122 | ||
123 | if (ioasa->rc.afu_rc) { | |
124 | /* We have an AFU error */ | |
125 | switch (ioasa->rc.afu_rc) { | |
126 | case SISL_AFU_RC_NO_CHANNELS: | |
8396012f | 127 | scp->result = (DID_NO_CONNECT << 16); |
c21e0bbf MO |
128 | break; |
129 | case SISL_AFU_RC_DATA_DMA_ERR: | |
130 | switch (ioasa->afu_extra) { | |
131 | case SISL_AFU_DMA_ERR_PAGE_IN: | |
132 | /* Retry */ | |
133 | scp->result = (DID_IMM_RETRY << 16); | |
134 | break; | |
135 | case SISL_AFU_DMA_ERR_INVALID_EA: | |
136 | default: | |
137 | scp->result = (DID_ERROR << 16); | |
138 | } | |
139 | break; | |
140 | case SISL_AFU_RC_OUT_OF_DATA_BUFS: | |
141 | /* Retry */ | |
142 | scp->result = (DID_ALLOC_FAILURE << 16); | |
143 | break; | |
144 | default: | |
145 | scp->result = (DID_ERROR << 16); | |
146 | } | |
147 | } | |
148 | } | |
149 | ||
150 | /** | |
151 | * cmd_complete() - command completion handler | |
152 | * @cmd: AFU command that has completed. | |
153 | * | |
154 | * Prepares and submits command that has either completed or timed out to | |
155 | * the SCSI stack. Checks AFU command back into command pool for non-internal | |
fe7f9698 | 156 | * (cmd->scp populated) commands. |
c21e0bbf MO |
157 | */ |
158 | static void cmd_complete(struct afu_cmd *cmd) | |
159 | { | |
160 | struct scsi_cmnd *scp; | |
c21e0bbf MO |
161 | ulong lock_flags; |
162 | struct afu *afu = cmd->parent; | |
163 | struct cxlflash_cfg *cfg = afu->parent; | |
88d33628 | 164 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
165 | bool cmd_is_tmf; |
166 | ||
fe7f9698 MO |
167 | if (cmd->scp) { |
168 | scp = cmd->scp; | |
8396012f | 169 | if (unlikely(cmd->sa.ioasc)) |
c21e0bbf MO |
170 | process_cmd_err(cmd, scp); |
171 | else | |
172 | scp->result = (DID_OK << 16); | |
173 | ||
c21e0bbf | 174 | cmd_is_tmf = cmd->cmd_tmf; |
c21e0bbf | 175 | |
88d33628 MO |
176 | dev_dbg_ratelimited(dev, "%s:scp=%p result=%08x ioasc=%08x\n", |
177 | __func__, scp, scp->result, cmd->sa.ioasc); | |
c21e0bbf | 178 | |
c21e0bbf MO |
179 | scsi_dma_unmap(scp); |
180 | scp->scsi_done(scp); | |
181 | ||
182 | if (cmd_is_tmf) { | |
018d1dc9 | 183 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
184 | cfg->tmf_active = false; |
185 | wake_up_all_locked(&cfg->tmf_waitq); | |
018d1dc9 | 186 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
187 | } |
188 | } else | |
189 | complete(&cmd->cevent); | |
190 | } | |
191 | ||
15305514 | 192 | /** |
74579cfb | 193 | * context_reset() - reset command owner context via specified register |
15305514 | 194 | * @cmd: AFU command that timed out. |
74579cfb | 195 | * @reset_reg: MMIO register to perform reset. |
15305514 | 196 | */ |
74579cfb | 197 | static void context_reset(struct afu_cmd *cmd, __be64 __iomem *reset_reg) |
15305514 MO |
198 | { |
199 | int nretry = 0; | |
200 | u64 rrin = 0x1; | |
15305514 | 201 | struct afu *afu = cmd->parent; |
3d2f617d UK |
202 | struct cxlflash_cfg *cfg = afu->parent; |
203 | struct device *dev = &cfg->dev->dev; | |
15305514 | 204 | |
88d33628 | 205 | dev_dbg(dev, "%s: cmd=%p\n", __func__, cmd); |
15305514 | 206 | |
74579cfb | 207 | writeq_be(rrin, reset_reg); |
15305514 | 208 | do { |
74579cfb | 209 | rrin = readq_be(reset_reg); |
15305514 MO |
210 | if (rrin != 0x1) |
211 | break; | |
212 | /* Double delay each time */ | |
ea765431 | 213 | udelay(1 << nretry); |
15305514 | 214 | } while (nretry++ < MC_ROOM_RETRY_CNT); |
3d2f617d | 215 | |
88d33628 | 216 | dev_dbg(dev, "%s: returning rrin=%016llx nretry=%d\n", |
3d2f617d | 217 | __func__, rrin, nretry); |
15305514 MO |
218 | } |
219 | ||
74579cfb MO |
220 | /** |
221 | * context_reset_ioarrin() - reset command owner context via IOARRIN register | |
222 | * @cmd: AFU command that timed out. | |
223 | */ | |
224 | static void context_reset_ioarrin(struct afu_cmd *cmd) | |
225 | { | |
226 | struct afu *afu = cmd->parent; | |
227 | ||
228 | context_reset(cmd, &afu->host_map->ioarrin); | |
229 | } | |
230 | ||
bae0ac69 MO |
231 | /** |
232 | * context_reset_sq() - reset command owner context w/ SQ Context Reset register | |
233 | * @cmd: AFU command that timed out. | |
234 | */ | |
235 | static void context_reset_sq(struct afu_cmd *cmd) | |
236 | { | |
237 | struct afu *afu = cmd->parent; | |
238 | ||
239 | context_reset(cmd, &afu->host_map->sq_ctx_reset); | |
240 | } | |
241 | ||
15305514 | 242 | /** |
48b4be36 | 243 | * send_cmd_ioarrin() - sends an AFU command via IOARRIN register |
15305514 MO |
244 | * @afu: AFU associated with the host. |
245 | * @cmd: AFU command to send. | |
246 | * | |
247 | * Return: | |
1284fb0c | 248 | * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure |
15305514 | 249 | */ |
48b4be36 | 250 | static int send_cmd_ioarrin(struct afu *afu, struct afu_cmd *cmd) |
15305514 MO |
251 | { |
252 | struct cxlflash_cfg *cfg = afu->parent; | |
253 | struct device *dev = &cfg->dev->dev; | |
15305514 | 254 | int rc = 0; |
11f7b184 UK |
255 | s64 room; |
256 | ulong lock_flags; | |
15305514 MO |
257 | |
258 | /* | |
11f7b184 UK |
259 | * To avoid the performance penalty of MMIO, spread the update of |
260 | * 'room' over multiple commands. | |
15305514 | 261 | */ |
11f7b184 UK |
262 | spin_lock_irqsave(&afu->rrin_slock, lock_flags); |
263 | if (--afu->room < 0) { | |
264 | room = readq_be(&afu->host_map->cmd_room); | |
265 | if (room <= 0) { | |
266 | dev_dbg_ratelimited(dev, "%s: no cmd_room to send " | |
267 | "0x%02X, room=0x%016llX\n", | |
268 | __func__, cmd->rcb.cdb[0], room); | |
269 | afu->room = 0; | |
270 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
271 | goto out; | |
15305514 | 272 | } |
11f7b184 | 273 | afu->room = room - 1; |
15305514 MO |
274 | } |
275 | ||
15305514 MO |
276 | writeq_be((u64)&cmd->rcb, &afu->host_map->ioarrin); |
277 | out: | |
11f7b184 | 278 | spin_unlock_irqrestore(&afu->rrin_slock, lock_flags); |
88d33628 MO |
279 | dev_dbg(dev, "%s: cmd=%p len=%u ea=%016llx rc=%d\n", __func__, |
280 | cmd, cmd->rcb.data_len, cmd->rcb.data_ea, rc); | |
15305514 | 281 | return rc; |
15305514 MO |
282 | } |
283 | ||
bae0ac69 MO |
284 | /** |
285 | * send_cmd_sq() - sends an AFU command via SQ ring | |
286 | * @afu: AFU associated with the host. | |
287 | * @cmd: AFU command to send. | |
288 | * | |
289 | * Return: | |
290 | * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure | |
291 | */ | |
292 | static int send_cmd_sq(struct afu *afu, struct afu_cmd *cmd) | |
293 | { | |
294 | struct cxlflash_cfg *cfg = afu->parent; | |
295 | struct device *dev = &cfg->dev->dev; | |
296 | int rc = 0; | |
297 | int newval; | |
298 | ulong lock_flags; | |
299 | ||
300 | newval = atomic_dec_if_positive(&afu->hsq_credits); | |
301 | if (newval <= 0) { | |
302 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
303 | goto out; | |
304 | } | |
305 | ||
306 | cmd->rcb.ioasa = &cmd->sa; | |
307 | ||
308 | spin_lock_irqsave(&afu->hsq_slock, lock_flags); | |
309 | ||
310 | *afu->hsq_curr = cmd->rcb; | |
311 | if (afu->hsq_curr < afu->hsq_end) | |
312 | afu->hsq_curr++; | |
313 | else | |
314 | afu->hsq_curr = afu->hsq_start; | |
315 | writeq_be((u64)afu->hsq_curr, &afu->host_map->sq_tail); | |
316 | ||
317 | spin_unlock_irqrestore(&afu->hsq_slock, lock_flags); | |
318 | out: | |
88d33628 MO |
319 | dev_dbg(dev, "%s: cmd=%p len=%u ea=%016llx ioasa=%p rc=%d curr=%p " |
320 | "head=%016llx tail=%016llx\n", __func__, cmd, cmd->rcb.data_len, | |
321 | cmd->rcb.data_ea, cmd->rcb.ioasa, rc, afu->hsq_curr, | |
bae0ac69 MO |
322 | readq_be(&afu->host_map->sq_head), |
323 | readq_be(&afu->host_map->sq_tail)); | |
324 | return rc; | |
325 | } | |
326 | ||
15305514 MO |
327 | /** |
328 | * wait_resp() - polls for a response or timeout to a sent AFU command | |
329 | * @afu: AFU associated with the host. | |
330 | * @cmd: AFU command that was sent. | |
9ba848ac MO |
331 | * |
332 | * Return: | |
333 | * 0 on success, -1 on timeout/error | |
15305514 | 334 | */ |
9ba848ac | 335 | static int wait_resp(struct afu *afu, struct afu_cmd *cmd) |
15305514 | 336 | { |
88d33628 MO |
337 | struct cxlflash_cfg *cfg = afu->parent; |
338 | struct device *dev = &cfg->dev->dev; | |
9ba848ac | 339 | int rc = 0; |
15305514 MO |
340 | ulong timeout = msecs_to_jiffies(cmd->rcb.timeout * 2 * 1000); |
341 | ||
342 | timeout = wait_for_completion_timeout(&cmd->cevent, timeout); | |
9ba848ac | 343 | if (!timeout) { |
48b4be36 | 344 | afu->context_reset(cmd); |
9ba848ac MO |
345 | rc = -1; |
346 | } | |
15305514 | 347 | |
9ba848ac | 348 | if (unlikely(cmd->sa.ioasc != 0)) { |
88d33628 MO |
349 | dev_err(dev, "%s: cmd %02x failed, ioasc=%08x\n", |
350 | __func__, cmd->rcb.cdb[0], cmd->sa.ioasc); | |
9ba848ac MO |
351 | rc = -1; |
352 | } | |
353 | ||
354 | return rc; | |
15305514 MO |
355 | } |
356 | ||
c21e0bbf MO |
357 | /** |
358 | * send_tmf() - sends a Task Management Function (TMF) | |
359 | * @afu: AFU to checkout from. | |
360 | * @scp: SCSI command from stack. | |
361 | * @tmfcmd: TMF command to send. | |
362 | * | |
363 | * Return: | |
1284fb0c | 364 | * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure |
c21e0bbf MO |
365 | */ |
366 | static int send_tmf(struct afu *afu, struct scsi_cmnd *scp, u64 tmfcmd) | |
367 | { | |
c21e0bbf | 368 | u32 port_sel = scp->device->channel + 1; |
88d33628 | 369 | struct cxlflash_cfg *cfg = shost_priv(scp->device->host); |
d4ace351 | 370 | struct afu_cmd *cmd = sc_to_afucz(scp); |
4392ba49 | 371 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
372 | ulong lock_flags; |
373 | int rc = 0; | |
018d1dc9 | 374 | ulong to; |
c21e0bbf | 375 | |
018d1dc9 MO |
376 | /* When Task Management Function is active do not send another */ |
377 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); | |
c21e0bbf | 378 | if (cfg->tmf_active) |
018d1dc9 MO |
379 | wait_event_interruptible_lock_irq(cfg->tmf_waitq, |
380 | !cfg->tmf_active, | |
381 | cfg->tmf_slock); | |
c21e0bbf | 382 | cfg->tmf_active = true; |
018d1dc9 | 383 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 384 | |
fe7f9698 | 385 | cmd->scp = scp; |
d4ace351 MO |
386 | cmd->parent = afu; |
387 | cmd->cmd_tmf = true; | |
388 | ||
c21e0bbf | 389 | cmd->rcb.ctx_id = afu->ctx_hndl; |
5fbb96c8 | 390 | cmd->rcb.msi = SISL_MSI_RRQ_UPDATED; |
c21e0bbf MO |
391 | cmd->rcb.port_sel = port_sel; |
392 | cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); | |
c21e0bbf | 393 | cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID | |
d4ace351 MO |
394 | SISL_REQ_FLAGS_SUP_UNDERRUN | |
395 | SISL_REQ_FLAGS_TMF_CMD); | |
c21e0bbf MO |
396 | memcpy(cmd->rcb.cdb, &tmfcmd, sizeof(tmfcmd)); |
397 | ||
48b4be36 | 398 | rc = afu->send_cmd(afu, cmd); |
c21e0bbf | 399 | if (unlikely(rc)) { |
018d1dc9 | 400 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 401 | cfg->tmf_active = false; |
018d1dc9 | 402 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
403 | goto out; |
404 | } | |
405 | ||
018d1dc9 MO |
406 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
407 | to = msecs_to_jiffies(5000); | |
408 | to = wait_event_interruptible_lock_irq_timeout(cfg->tmf_waitq, | |
409 | !cfg->tmf_active, | |
410 | cfg->tmf_slock, | |
411 | to); | |
412 | if (!to) { | |
413 | cfg->tmf_active = false; | |
88d33628 | 414 | dev_err(dev, "%s: TMF timed out\n", __func__); |
018d1dc9 MO |
415 | rc = -1; |
416 | } | |
417 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); | |
c21e0bbf MO |
418 | out: |
419 | return rc; | |
420 | } | |
421 | ||
422 | /** | |
423 | * cxlflash_driver_info() - information handler for this host driver | |
424 | * @host: SCSI host associated with device. | |
425 | * | |
426 | * Return: A string describing the device. | |
427 | */ | |
428 | static const char *cxlflash_driver_info(struct Scsi_Host *host) | |
429 | { | |
430 | return CXLFLASH_ADAPTER_NAME; | |
431 | } | |
432 | ||
433 | /** | |
434 | * cxlflash_queuecommand() - sends a mid-layer request | |
435 | * @host: SCSI host associated with device. | |
436 | * @scp: SCSI command to send. | |
437 | * | |
1284fb0c | 438 | * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure |
c21e0bbf MO |
439 | */ |
440 | static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp) | |
441 | { | |
88d33628 | 442 | struct cxlflash_cfg *cfg = shost_priv(host); |
c21e0bbf | 443 | struct afu *afu = cfg->afu; |
4392ba49 | 444 | struct device *dev = &cfg->dev->dev; |
5fbb96c8 | 445 | struct afu_cmd *cmd = sc_to_afucz(scp); |
9d89326c | 446 | struct scatterlist *sg = scsi_sglist(scp); |
c21e0bbf | 447 | u32 port_sel = scp->device->channel + 1; |
9d89326c | 448 | u16 req_flags = SISL_REQ_FLAGS_SUP_UNDERRUN; |
c21e0bbf | 449 | ulong lock_flags; |
9d89326c | 450 | int nseg = 0; |
c21e0bbf MO |
451 | int rc = 0; |
452 | ||
4392ba49 | 453 | dev_dbg_ratelimited(dev, "%s: (scp=%p) %d/%d/%d/%llu " |
88d33628 | 454 | "cdb=(%08x-%08x-%08x-%08x)\n", |
4392ba49 MO |
455 | __func__, scp, host->host_no, scp->device->channel, |
456 | scp->device->id, scp->device->lun, | |
457 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
458 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
459 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
460 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
c21e0bbf | 461 | |
018d1dc9 MO |
462 | /* |
463 | * If a Task Management Function is active, wait for it to complete | |
c21e0bbf MO |
464 | * before continuing with regular commands. |
465 | */ | |
018d1dc9 | 466 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 467 | if (cfg->tmf_active) { |
018d1dc9 | 468 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
469 | rc = SCSI_MLQUEUE_HOST_BUSY; |
470 | goto out; | |
471 | } | |
018d1dc9 | 472 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 473 | |
5cdac81a | 474 | switch (cfg->state) { |
439e85c1 | 475 | case STATE_RESET: |
88d33628 | 476 | dev_dbg_ratelimited(dev, "%s: device is in reset\n", __func__); |
5cdac81a MO |
477 | rc = SCSI_MLQUEUE_HOST_BUSY; |
478 | goto out; | |
479 | case STATE_FAILTERM: | |
88d33628 | 480 | dev_dbg_ratelimited(dev, "%s: device has failed\n", __func__); |
5cdac81a MO |
481 | scp->result = (DID_NO_CONNECT << 16); |
482 | scp->scsi_done(scp); | |
483 | rc = 0; | |
484 | goto out; | |
485 | default: | |
486 | break; | |
487 | } | |
488 | ||
9d89326c MO |
489 | if (likely(sg)) { |
490 | nseg = scsi_dma_map(scp); | |
491 | if (unlikely(nseg < 0)) { | |
88d33628 | 492 | dev_err(dev, "%s: Fail DMA map\n", __func__); |
9d89326c MO |
493 | rc = SCSI_MLQUEUE_HOST_BUSY; |
494 | goto out; | |
495 | } | |
c21e0bbf | 496 | |
9d89326c MO |
497 | cmd->rcb.data_len = sg_dma_len(sg); |
498 | cmd->rcb.data_ea = sg_dma_address(sg); | |
499 | } | |
c21e0bbf | 500 | |
fe7f9698 | 501 | cmd->scp = scp; |
5fbb96c8 | 502 | cmd->parent = afu; |
c21e0bbf | 503 | |
9d89326c MO |
504 | cmd->rcb.ctx_id = afu->ctx_hndl; |
505 | cmd->rcb.msi = SISL_MSI_RRQ_UPDATED; | |
506 | cmd->rcb.port_sel = port_sel; | |
507 | cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); | |
c21e0bbf | 508 | |
9d89326c MO |
509 | if (scp->sc_data_direction == DMA_TO_DEVICE) |
510 | req_flags |= SISL_REQ_FLAGS_HOST_WRITE; | |
c21e0bbf | 511 | |
9d89326c | 512 | cmd->rcb.req_flags = req_flags; |
c21e0bbf MO |
513 | memcpy(cmd->rcb.cdb, scp->cmnd, sizeof(cmd->rcb.cdb)); |
514 | ||
48b4be36 | 515 | rc = afu->send_cmd(afu, cmd); |
5fbb96c8 | 516 | if (unlikely(rc)) |
c21e0bbf | 517 | scsi_dma_unmap(scp); |
c21e0bbf MO |
518 | out: |
519 | return rc; | |
520 | } | |
521 | ||
522 | /** | |
15305514 | 523 | * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe |
1284fb0c | 524 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 525 | */ |
15305514 | 526 | static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg *cfg) |
c21e0bbf | 527 | { |
15305514 | 528 | struct pci_dev *pdev = cfg->dev; |
c21e0bbf | 529 | |
15305514 MO |
530 | if (pci_channel_offline(pdev)) |
531 | wait_event_timeout(cfg->reset_waitq, | |
532 | !pci_channel_offline(pdev), | |
533 | CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT); | |
c21e0bbf MO |
534 | } |
535 | ||
536 | /** | |
15305514 | 537 | * free_mem() - free memory associated with the AFU |
1284fb0c | 538 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 539 | */ |
15305514 | 540 | static void free_mem(struct cxlflash_cfg *cfg) |
c21e0bbf | 541 | { |
15305514 | 542 | struct afu *afu = cfg->afu; |
c21e0bbf | 543 | |
15305514 | 544 | if (cfg->afu) { |
15305514 MO |
545 | free_pages((ulong)afu, get_order(sizeof(struct afu))); |
546 | cfg->afu = NULL; | |
5cdac81a | 547 | } |
c21e0bbf MO |
548 | } |
549 | ||
550 | /** | |
15305514 | 551 | * stop_afu() - stops the AFU command timers and unmaps the MMIO space |
1284fb0c | 552 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 553 | * |
15305514 | 554 | * Safe to call with AFU in a partially allocated/initialized state. |
ee91e332 | 555 | * |
d940f9ae UK |
556 | * Cancels scheduled worker threads, waits for any active internal AFU |
557 | * commands to timeout and then unmaps the MMIO space. | |
c21e0bbf | 558 | */ |
15305514 | 559 | static void stop_afu(struct cxlflash_cfg *cfg) |
c21e0bbf | 560 | { |
15305514 | 561 | struct afu *afu = cfg->afu; |
c21e0bbf | 562 | |
d940f9ae UK |
563 | cancel_work_sync(&cfg->work_q); |
564 | ||
15305514 | 565 | if (likely(afu)) { |
de01283b MO |
566 | while (atomic_read(&afu->cmds_active)) |
567 | ssleep(1); | |
c21e0bbf | 568 | if (likely(afu->afu_map)) { |
1786f4a0 | 569 | cxl_psa_unmap((void __iomem *)afu->afu_map); |
c21e0bbf MO |
570 | afu->afu_map = NULL; |
571 | } | |
572 | } | |
573 | } | |
574 | ||
575 | /** | |
9526f360 | 576 | * term_intr() - disables all AFU interrupts |
1284fb0c | 577 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
578 | * @level: Depth of allocation, where to begin waterfall tear down. |
579 | * | |
580 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
581 | */ | |
9526f360 | 582 | static void term_intr(struct cxlflash_cfg *cfg, enum undo_level level) |
c21e0bbf | 583 | { |
c21e0bbf | 584 | struct afu *afu = cfg->afu; |
4392ba49 | 585 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
586 | |
587 | if (!afu || !cfg->mcctx) { | |
9526f360 | 588 | dev_err(dev, "%s: returning with NULL afu or MC\n", __func__); |
c21e0bbf MO |
589 | return; |
590 | } | |
591 | ||
592 | switch (level) { | |
c21e0bbf MO |
593 | case UNMAP_THREE: |
594 | cxl_unmap_afu_irq(cfg->mcctx, 3, afu); | |
595 | case UNMAP_TWO: | |
596 | cxl_unmap_afu_irq(cfg->mcctx, 2, afu); | |
597 | case UNMAP_ONE: | |
598 | cxl_unmap_afu_irq(cfg->mcctx, 1, afu); | |
599 | case FREE_IRQ: | |
600 | cxl_free_afu_irqs(cfg->mcctx); | |
9526f360 MK |
601 | /* fall through */ |
602 | case UNDO_NOOP: | |
603 | /* No action required */ | |
604 | break; | |
605 | } | |
606 | } | |
607 | ||
608 | /** | |
609 | * term_mc() - terminates the master context | |
610 | * @cfg: Internal structure associated with the host. | |
611 | * @level: Depth of allocation, where to begin waterfall tear down. | |
612 | * | |
613 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
614 | */ | |
615 | static void term_mc(struct cxlflash_cfg *cfg) | |
616 | { | |
617 | int rc = 0; | |
618 | struct afu *afu = cfg->afu; | |
619 | struct device *dev = &cfg->dev->dev; | |
620 | ||
621 | if (!afu || !cfg->mcctx) { | |
622 | dev_err(dev, "%s: returning with NULL afu or MC\n", __func__); | |
623 | return; | |
c21e0bbf | 624 | } |
9526f360 MK |
625 | |
626 | rc = cxl_stop_context(cfg->mcctx); | |
627 | WARN_ON(rc); | |
628 | cfg->mcctx = NULL; | |
c21e0bbf MO |
629 | } |
630 | ||
631 | /** | |
632 | * term_afu() - terminates the AFU | |
1284fb0c | 633 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
634 | * |
635 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
636 | */ | |
637 | static void term_afu(struct cxlflash_cfg *cfg) | |
638 | { | |
88d33628 MO |
639 | struct device *dev = &cfg->dev->dev; |
640 | ||
9526f360 MK |
641 | /* |
642 | * Tear down is carefully orchestrated to ensure | |
643 | * no interrupts can come in when the problem state | |
644 | * area is unmapped. | |
645 | * | |
646 | * 1) Disable all AFU interrupts | |
647 | * 2) Unmap the problem state area | |
648 | * 3) Stop the master context | |
649 | */ | |
650 | term_intr(cfg, UNMAP_THREE); | |
c21e0bbf MO |
651 | if (cfg->afu) |
652 | stop_afu(cfg); | |
653 | ||
9526f360 | 654 | term_mc(cfg); |
6ded8b3c | 655 | |
88d33628 | 656 | dev_dbg(dev, "%s: returning\n", __func__); |
c21e0bbf MO |
657 | } |
658 | ||
704c4b0d UK |
659 | /** |
660 | * notify_shutdown() - notifies device of pending shutdown | |
661 | * @cfg: Internal structure associated with the host. | |
662 | * @wait: Whether to wait for shutdown processing to complete. | |
663 | * | |
664 | * This function will notify the AFU that the adapter is being shutdown | |
665 | * and will wait for shutdown processing to complete if wait is true. | |
666 | * This notification should flush pending I/Os to the device and halt | |
667 | * further I/Os until the next AFU reset is issued and device restarted. | |
668 | */ | |
669 | static void notify_shutdown(struct cxlflash_cfg *cfg, bool wait) | |
670 | { | |
671 | struct afu *afu = cfg->afu; | |
672 | struct device *dev = &cfg->dev->dev; | |
1bd2b282 | 673 | struct sisl_global_map __iomem *global; |
704c4b0d UK |
674 | struct dev_dependent_vals *ddv; |
675 | u64 reg, status; | |
676 | int i, retry_cnt = 0; | |
677 | ||
678 | ddv = (struct dev_dependent_vals *)cfg->dev_id->driver_data; | |
679 | if (!(ddv->flags & CXLFLASH_NOTIFY_SHUTDOWN)) | |
680 | return; | |
681 | ||
1bd2b282 | 682 | if (!afu || !afu->afu_map) { |
88d33628 | 683 | dev_dbg(dev, "%s: Problem state area not mapped\n", __func__); |
1bd2b282 UK |
684 | return; |
685 | } | |
686 | ||
687 | global = &afu->afu_map->global; | |
688 | ||
704c4b0d UK |
689 | /* Notify AFU */ |
690 | for (i = 0; i < NUM_FC_PORTS; i++) { | |
691 | reg = readq_be(&global->fc_regs[i][FC_CONFIG2 / 8]); | |
692 | reg |= SISL_FC_SHUTDOWN_NORMAL; | |
693 | writeq_be(reg, &global->fc_regs[i][FC_CONFIG2 / 8]); | |
694 | } | |
695 | ||
696 | if (!wait) | |
697 | return; | |
698 | ||
699 | /* Wait up to 1.5 seconds for shutdown processing to complete */ | |
700 | for (i = 0; i < NUM_FC_PORTS; i++) { | |
701 | retry_cnt = 0; | |
702 | while (true) { | |
703 | status = readq_be(&global->fc_regs[i][FC_STATUS / 8]); | |
704 | if (status & SISL_STATUS_SHUTDOWN_COMPLETE) | |
705 | break; | |
706 | if (++retry_cnt >= MC_RETRY_CNT) { | |
707 | dev_dbg(dev, "%s: port %d shutdown processing " | |
708 | "not yet completed\n", __func__, i); | |
709 | break; | |
710 | } | |
711 | msleep(100 * retry_cnt); | |
712 | } | |
713 | } | |
714 | } | |
715 | ||
c21e0bbf MO |
716 | /** |
717 | * cxlflash_remove() - PCI entry point to tear down host | |
718 | * @pdev: PCI device associated with the host. | |
719 | * | |
720 | * Safe to use as a cleanup in partially allocated/initialized state. | |
721 | */ | |
722 | static void cxlflash_remove(struct pci_dev *pdev) | |
723 | { | |
724 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
88d33628 | 725 | struct device *dev = &pdev->dev; |
c21e0bbf MO |
726 | ulong lock_flags; |
727 | ||
babf985d | 728 | if (!pci_is_enabled(pdev)) { |
88d33628 | 729 | dev_dbg(dev, "%s: Device is disabled\n", __func__); |
babf985d UK |
730 | return; |
731 | } | |
732 | ||
c21e0bbf MO |
733 | /* If a Task Management Function is active, wait for it to complete |
734 | * before continuing with remove. | |
735 | */ | |
018d1dc9 | 736 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 737 | if (cfg->tmf_active) |
018d1dc9 MO |
738 | wait_event_interruptible_lock_irq(cfg->tmf_waitq, |
739 | !cfg->tmf_active, | |
740 | cfg->tmf_slock); | |
741 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); | |
c21e0bbf | 742 | |
704c4b0d UK |
743 | /* Notify AFU and wait for shutdown processing to complete */ |
744 | notify_shutdown(cfg, true); | |
745 | ||
5cdac81a | 746 | cfg->state = STATE_FAILTERM; |
65be2c79 | 747 | cxlflash_stop_term_user_contexts(cfg); |
5cdac81a | 748 | |
c21e0bbf MO |
749 | switch (cfg->init_state) { |
750 | case INIT_STATE_SCSI: | |
65be2c79 | 751 | cxlflash_term_local_luns(cfg); |
c21e0bbf | 752 | scsi_remove_host(cfg->host); |
f15fbf8d | 753 | /* fall through */ |
c21e0bbf | 754 | case INIT_STATE_AFU: |
b45cdbaf | 755 | term_afu(cfg); |
c21e0bbf | 756 | case INIT_STATE_PCI: |
c21e0bbf MO |
757 | pci_disable_device(pdev); |
758 | case INIT_STATE_NONE: | |
c21e0bbf | 759 | free_mem(cfg); |
8b5b1e87 | 760 | scsi_host_put(cfg->host); |
c21e0bbf MO |
761 | break; |
762 | } | |
763 | ||
88d33628 | 764 | dev_dbg(dev, "%s: returning\n", __func__); |
c21e0bbf MO |
765 | } |
766 | ||
767 | /** | |
768 | * alloc_mem() - allocates the AFU and its command pool | |
1284fb0c | 769 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
770 | * |
771 | * A partially allocated state remains on failure. | |
772 | * | |
773 | * Return: | |
774 | * 0 on success | |
775 | * -ENOMEM on failure to allocate memory | |
776 | */ | |
777 | static int alloc_mem(struct cxlflash_cfg *cfg) | |
778 | { | |
779 | int rc = 0; | |
4392ba49 | 780 | struct device *dev = &cfg->dev->dev; |
c21e0bbf | 781 | |
bae0ac69 | 782 | /* AFU is ~28k, i.e. only one 64k page or up to seven 4k pages */ |
c21e0bbf MO |
783 | cfg->afu = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, |
784 | get_order(sizeof(struct afu))); | |
785 | if (unlikely(!cfg->afu)) { | |
4392ba49 MO |
786 | dev_err(dev, "%s: cannot get %d free pages\n", |
787 | __func__, get_order(sizeof(struct afu))); | |
c21e0bbf MO |
788 | rc = -ENOMEM; |
789 | goto out; | |
790 | } | |
791 | cfg->afu->parent = cfg; | |
792 | cfg->afu->afu_map = NULL; | |
c21e0bbf MO |
793 | out: |
794 | return rc; | |
795 | } | |
796 | ||
797 | /** | |
798 | * init_pci() - initializes the host as a PCI device | |
1284fb0c | 799 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 800 | * |
1284fb0c | 801 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
802 | */ |
803 | static int init_pci(struct cxlflash_cfg *cfg) | |
804 | { | |
805 | struct pci_dev *pdev = cfg->dev; | |
88d33628 | 806 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
807 | int rc = 0; |
808 | ||
c21e0bbf MO |
809 | rc = pci_enable_device(pdev); |
810 | if (rc || pci_channel_offline(pdev)) { | |
811 | if (pci_channel_offline(pdev)) { | |
812 | cxlflash_wait_for_pci_err_recovery(cfg); | |
813 | rc = pci_enable_device(pdev); | |
814 | } | |
815 | ||
816 | if (rc) { | |
88d33628 | 817 | dev_err(dev, "%s: Cannot enable adapter\n", __func__); |
c21e0bbf | 818 | cxlflash_wait_for_pci_err_recovery(cfg); |
961487e4 | 819 | goto out; |
c21e0bbf MO |
820 | } |
821 | } | |
822 | ||
c21e0bbf | 823 | out: |
88d33628 | 824 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf | 825 | return rc; |
c21e0bbf MO |
826 | } |
827 | ||
828 | /** | |
829 | * init_scsi() - adds the host to the SCSI stack and kicks off host scan | |
1284fb0c | 830 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 831 | * |
1284fb0c | 832 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
833 | */ |
834 | static int init_scsi(struct cxlflash_cfg *cfg) | |
835 | { | |
836 | struct pci_dev *pdev = cfg->dev; | |
88d33628 | 837 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
838 | int rc = 0; |
839 | ||
840 | rc = scsi_add_host(cfg->host, &pdev->dev); | |
841 | if (rc) { | |
88d33628 | 842 | dev_err(dev, "%s: scsi_add_host failed rc=%d\n", __func__, rc); |
c21e0bbf MO |
843 | goto out; |
844 | } | |
845 | ||
846 | scsi_scan_host(cfg->host); | |
847 | ||
848 | out: | |
88d33628 | 849 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
850 | return rc; |
851 | } | |
852 | ||
853 | /** | |
854 | * set_port_online() - transitions the specified host FC port to online state | |
855 | * @fc_regs: Top of MMIO region defined for specified port. | |
856 | * | |
857 | * The provided MMIO region must be mapped prior to call. Online state means | |
858 | * that the FC link layer has synced, completed the handshaking process, and | |
859 | * is ready for login to start. | |
860 | */ | |
1786f4a0 | 861 | static void set_port_online(__be64 __iomem *fc_regs) |
c21e0bbf MO |
862 | { |
863 | u64 cmdcfg; | |
864 | ||
865 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
866 | cmdcfg &= (~FC_MTIP_CMDCONFIG_OFFLINE); /* clear OFF_LINE */ | |
867 | cmdcfg |= (FC_MTIP_CMDCONFIG_ONLINE); /* set ON_LINE */ | |
868 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
869 | } | |
870 | ||
871 | /** | |
872 | * set_port_offline() - transitions the specified host FC port to offline state | |
873 | * @fc_regs: Top of MMIO region defined for specified port. | |
874 | * | |
875 | * The provided MMIO region must be mapped prior to call. | |
876 | */ | |
1786f4a0 | 877 | static void set_port_offline(__be64 __iomem *fc_regs) |
c21e0bbf MO |
878 | { |
879 | u64 cmdcfg; | |
880 | ||
881 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
882 | cmdcfg &= (~FC_MTIP_CMDCONFIG_ONLINE); /* clear ON_LINE */ | |
883 | cmdcfg |= (FC_MTIP_CMDCONFIG_OFFLINE); /* set OFF_LINE */ | |
884 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
885 | } | |
886 | ||
887 | /** | |
888 | * wait_port_online() - waits for the specified host FC port come online | |
889 | * @fc_regs: Top of MMIO region defined for specified port. | |
890 | * @delay_us: Number of microseconds to delay between reading port status. | |
891 | * @nretry: Number of cycles to retry reading port status. | |
892 | * | |
893 | * The provided MMIO region must be mapped prior to call. This will timeout | |
894 | * when the cable is not plugged in. | |
895 | * | |
896 | * Return: | |
897 | * TRUE (1) when the specified port is online | |
898 | * FALSE (0) when the specified port fails to come online after timeout | |
c21e0bbf | 899 | */ |
88d33628 | 900 | static bool wait_port_online(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) |
c21e0bbf MO |
901 | { |
902 | u64 status; | |
903 | ||
88d33628 | 904 | WARN_ON(delay_us < 1000); |
c21e0bbf MO |
905 | |
906 | do { | |
907 | msleep(delay_us / 1000); | |
908 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); | |
05dab432 MO |
909 | if (status == U64_MAX) |
910 | nretry /= 2; | |
c21e0bbf MO |
911 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_ONLINE && |
912 | nretry--); | |
913 | ||
914 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_ONLINE); | |
915 | } | |
916 | ||
917 | /** | |
918 | * wait_port_offline() - waits for the specified host FC port go offline | |
919 | * @fc_regs: Top of MMIO region defined for specified port. | |
920 | * @delay_us: Number of microseconds to delay between reading port status. | |
921 | * @nretry: Number of cycles to retry reading port status. | |
922 | * | |
923 | * The provided MMIO region must be mapped prior to call. | |
924 | * | |
925 | * Return: | |
926 | * TRUE (1) when the specified port is offline | |
927 | * FALSE (0) when the specified port fails to go offline after timeout | |
c21e0bbf | 928 | */ |
88d33628 | 929 | static bool wait_port_offline(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) |
c21e0bbf MO |
930 | { |
931 | u64 status; | |
932 | ||
88d33628 | 933 | WARN_ON(delay_us < 1000); |
c21e0bbf MO |
934 | |
935 | do { | |
936 | msleep(delay_us / 1000); | |
937 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); | |
05dab432 MO |
938 | if (status == U64_MAX) |
939 | nretry /= 2; | |
c21e0bbf MO |
940 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_OFFLINE && |
941 | nretry--); | |
942 | ||
943 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_OFFLINE); | |
944 | } | |
945 | ||
946 | /** | |
947 | * afu_set_wwpn() - configures the WWPN for the specified host FC port | |
948 | * @afu: AFU associated with the host that owns the specified FC port. | |
949 | * @port: Port number being configured. | |
950 | * @fc_regs: Top of MMIO region defined for specified port. | |
951 | * @wwpn: The world-wide-port-number previously discovered for port. | |
952 | * | |
953 | * The provided MMIO region must be mapped prior to call. As part of the | |
954 | * sequence to configure the WWPN, the port is toggled offline and then back | |
955 | * online. This toggling action can cause this routine to delay up to a few | |
956 | * seconds. When configured to use the internal LUN feature of the AFU, a | |
957 | * failure to come online is overridden. | |
c21e0bbf | 958 | */ |
f8013261 MO |
959 | static void afu_set_wwpn(struct afu *afu, int port, __be64 __iomem *fc_regs, |
960 | u64 wwpn) | |
c21e0bbf | 961 | { |
88d33628 MO |
962 | struct cxlflash_cfg *cfg = afu->parent; |
963 | struct device *dev = &cfg->dev->dev; | |
964 | ||
c21e0bbf | 965 | set_port_offline(fc_regs); |
c21e0bbf MO |
966 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, |
967 | FC_PORT_STATUS_RETRY_CNT)) { | |
88d33628 MO |
968 | dev_dbg(dev, "%s: wait on port %d to go offline timed out\n", |
969 | __func__, port); | |
c21e0bbf MO |
970 | } |
971 | ||
f8013261 | 972 | writeq_be(wwpn, &fc_regs[FC_PNAME / 8]); |
964497b3 | 973 | |
c21e0bbf | 974 | set_port_online(fc_regs); |
c21e0bbf MO |
975 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, |
976 | FC_PORT_STATUS_RETRY_CNT)) { | |
88d33628 MO |
977 | dev_dbg(dev, "%s: wait on port %d to go online timed out\n", |
978 | __func__, port); | |
c21e0bbf | 979 | } |
c21e0bbf MO |
980 | } |
981 | ||
982 | /** | |
983 | * afu_link_reset() - resets the specified host FC port | |
984 | * @afu: AFU associated with the host that owns the specified FC port. | |
985 | * @port: Port number being configured. | |
986 | * @fc_regs: Top of MMIO region defined for specified port. | |
987 | * | |
988 | * The provided MMIO region must be mapped prior to call. The sequence to | |
989 | * reset the port involves toggling it offline and then back online. This | |
990 | * action can cause this routine to delay up to a few seconds. An effort | |
991 | * is made to maintain link with the device by switching to host to use | |
992 | * the alternate port exclusively while the reset takes place. | |
993 | * failure to come online is overridden. | |
994 | */ | |
1786f4a0 | 995 | static void afu_link_reset(struct afu *afu, int port, __be64 __iomem *fc_regs) |
c21e0bbf | 996 | { |
88d33628 MO |
997 | struct cxlflash_cfg *cfg = afu->parent; |
998 | struct device *dev = &cfg->dev->dev; | |
c21e0bbf MO |
999 | u64 port_sel; |
1000 | ||
1001 | /* first switch the AFU to the other links, if any */ | |
1002 | port_sel = readq_be(&afu->afu_map->global.regs.afu_port_sel); | |
4da74db0 | 1003 | port_sel &= ~(1ULL << port); |
c21e0bbf MO |
1004 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); |
1005 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); | |
1006 | ||
1007 | set_port_offline(fc_regs); | |
1008 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1009 | FC_PORT_STATUS_RETRY_CNT)) | |
88d33628 MO |
1010 | dev_err(dev, "%s: wait on port %d to go offline timed out\n", |
1011 | __func__, port); | |
c21e0bbf MO |
1012 | |
1013 | set_port_online(fc_regs); | |
1014 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1015 | FC_PORT_STATUS_RETRY_CNT)) | |
88d33628 MO |
1016 | dev_err(dev, "%s: wait on port %d to go online timed out\n", |
1017 | __func__, port); | |
c21e0bbf MO |
1018 | |
1019 | /* switch back to include this port */ | |
4da74db0 | 1020 | port_sel |= (1ULL << port); |
c21e0bbf MO |
1021 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); |
1022 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); | |
1023 | ||
88d33628 | 1024 | dev_dbg(dev, "%s: returning port_sel=%016llx\n", __func__, port_sel); |
c21e0bbf MO |
1025 | } |
1026 | ||
1027 | /* | |
1028 | * Asynchronous interrupt information table | |
1029 | */ | |
1030 | static const struct asyc_intr_info ainfo[] = { | |
1031 | {SISL_ASTATUS_FC0_OTHER, "other error", 0, CLR_FC_ERROR | LINK_RESET}, | |
1032 | {SISL_ASTATUS_FC0_LOGO, "target initiated LOGO", 0, 0}, | |
1033 | {SISL_ASTATUS_FC0_CRC_T, "CRC threshold exceeded", 0, LINK_RESET}, | |
e6e6df3f | 1034 | {SISL_ASTATUS_FC0_LOGI_R, "login timed out, retrying", 0, LINK_RESET}, |
c21e0bbf | 1035 | {SISL_ASTATUS_FC0_LOGI_F, "login failed", 0, CLR_FC_ERROR}, |
ef51074a | 1036 | {SISL_ASTATUS_FC0_LOGI_S, "login succeeded", 0, SCAN_HOST}, |
c21e0bbf | 1037 | {SISL_ASTATUS_FC0_LINK_DN, "link down", 0, 0}, |
bbbfae96 | 1038 | {SISL_ASTATUS_FC0_LINK_UP, "link up", 0, 0}, |
c21e0bbf MO |
1039 | {SISL_ASTATUS_FC1_OTHER, "other error", 1, CLR_FC_ERROR | LINK_RESET}, |
1040 | {SISL_ASTATUS_FC1_LOGO, "target initiated LOGO", 1, 0}, | |
1041 | {SISL_ASTATUS_FC1_CRC_T, "CRC threshold exceeded", 1, LINK_RESET}, | |
a9be294e | 1042 | {SISL_ASTATUS_FC1_LOGI_R, "login timed out, retrying", 1, LINK_RESET}, |
c21e0bbf | 1043 | {SISL_ASTATUS_FC1_LOGI_F, "login failed", 1, CLR_FC_ERROR}, |
ef51074a | 1044 | {SISL_ASTATUS_FC1_LOGI_S, "login succeeded", 1, SCAN_HOST}, |
c21e0bbf | 1045 | {SISL_ASTATUS_FC1_LINK_DN, "link down", 1, 0}, |
bbbfae96 | 1046 | {SISL_ASTATUS_FC1_LINK_UP, "link up", 1, 0}, |
c21e0bbf MO |
1047 | {0x0, "", 0, 0} /* terminator */ |
1048 | }; | |
1049 | ||
1050 | /** | |
1051 | * find_ainfo() - locates and returns asynchronous interrupt information | |
1052 | * @status: Status code set by AFU on error. | |
1053 | * | |
1054 | * Return: The located information or NULL when the status code is invalid. | |
1055 | */ | |
1056 | static const struct asyc_intr_info *find_ainfo(u64 status) | |
1057 | { | |
1058 | const struct asyc_intr_info *info; | |
1059 | ||
1060 | for (info = &ainfo[0]; info->status; info++) | |
1061 | if (info->status == status) | |
1062 | return info; | |
1063 | ||
1064 | return NULL; | |
1065 | } | |
1066 | ||
1067 | /** | |
1068 | * afu_err_intr_init() - clears and initializes the AFU for error interrupts | |
1069 | * @afu: AFU associated with the host. | |
1070 | */ | |
1071 | static void afu_err_intr_init(struct afu *afu) | |
1072 | { | |
1073 | int i; | |
1074 | u64 reg; | |
1075 | ||
1076 | /* global async interrupts: AFU clears afu_ctrl on context exit | |
1077 | * if async interrupts were sent to that context. This prevents | |
1078 | * the AFU form sending further async interrupts when | |
1079 | * there is | |
1080 | * nobody to receive them. | |
1081 | */ | |
1082 | ||
1083 | /* mask all */ | |
1084 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_mask); | |
1085 | /* set LISN# to send and point to master context */ | |
1086 | reg = ((u64) (((afu->ctx_hndl << 8) | SISL_MSI_ASYNC_ERROR)) << 40); | |
1087 | ||
1088 | if (afu->internal_lun) | |
1089 | reg |= 1; /* Bit 63 indicates local lun */ | |
1090 | writeq_be(reg, &afu->afu_map->global.regs.afu_ctrl); | |
1091 | /* clear all */ | |
1092 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); | |
1093 | /* unmask bits that are of interest */ | |
1094 | /* note: afu can send an interrupt after this step */ | |
1095 | writeq_be(SISL_ASTATUS_MASK, &afu->afu_map->global.regs.aintr_mask); | |
1096 | /* clear again in case a bit came on after previous clear but before */ | |
1097 | /* unmask */ | |
1098 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); | |
1099 | ||
1100 | /* Clear/Set internal lun bits */ | |
1101 | reg = readq_be(&afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); | |
1102 | reg &= SISL_FC_INTERNAL_MASK; | |
1103 | if (afu->internal_lun) | |
1104 | reg |= ((u64)(afu->internal_lun - 1) << SISL_FC_INTERNAL_SHIFT); | |
1105 | writeq_be(reg, &afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); | |
1106 | ||
1107 | /* now clear FC errors */ | |
1108 | for (i = 0; i < NUM_FC_PORTS; i++) { | |
1109 | writeq_be(0xFFFFFFFFU, | |
1110 | &afu->afu_map->global.fc_regs[i][FC_ERROR / 8]); | |
1111 | writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRCAP / 8]); | |
1112 | } | |
1113 | ||
1114 | /* sync interrupts for master's IOARRIN write */ | |
1115 | /* note that unlike asyncs, there can be no pending sync interrupts */ | |
1116 | /* at this time (this is a fresh context and master has not written */ | |
1117 | /* IOARRIN yet), so there is nothing to clear. */ | |
1118 | ||
1119 | /* set LISN#, it is always sent to the context that wrote IOARRIN */ | |
1120 | writeq_be(SISL_MSI_SYNC_ERROR, &afu->host_map->ctx_ctrl); | |
1121 | writeq_be(SISL_ISTATUS_MASK, &afu->host_map->intr_mask); | |
1122 | } | |
1123 | ||
1124 | /** | |
1125 | * cxlflash_sync_err_irq() - interrupt handler for synchronous errors | |
1126 | * @irq: Interrupt number. | |
1127 | * @data: Private data provided at interrupt registration, the AFU. | |
1128 | * | |
1129 | * Return: Always return IRQ_HANDLED. | |
1130 | */ | |
1131 | static irqreturn_t cxlflash_sync_err_irq(int irq, void *data) | |
1132 | { | |
1133 | struct afu *afu = (struct afu *)data; | |
88d33628 MO |
1134 | struct cxlflash_cfg *cfg = afu->parent; |
1135 | struct device *dev = &cfg->dev->dev; | |
c21e0bbf MO |
1136 | u64 reg; |
1137 | u64 reg_unmasked; | |
1138 | ||
1139 | reg = readq_be(&afu->host_map->intr_status); | |
1140 | reg_unmasked = (reg & SISL_ISTATUS_UNMASK); | |
1141 | ||
1142 | if (reg_unmasked == 0UL) { | |
88d33628 MO |
1143 | dev_err(dev, "%s: spurious interrupt, intr_status=%016llx\n", |
1144 | __func__, reg); | |
c21e0bbf MO |
1145 | goto cxlflash_sync_err_irq_exit; |
1146 | } | |
1147 | ||
88d33628 MO |
1148 | dev_err(dev, "%s: unexpected interrupt, intr_status=%016llx\n", |
1149 | __func__, reg); | |
c21e0bbf MO |
1150 | |
1151 | writeq_be(reg_unmasked, &afu->host_map->intr_clear); | |
1152 | ||
1153 | cxlflash_sync_err_irq_exit: | |
c21e0bbf MO |
1154 | return IRQ_HANDLED; |
1155 | } | |
1156 | ||
1157 | /** | |
1158 | * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path) | |
1159 | * @irq: Interrupt number. | |
1160 | * @data: Private data provided at interrupt registration, the AFU. | |
1161 | * | |
1162 | * Return: Always return IRQ_HANDLED. | |
1163 | */ | |
1164 | static irqreturn_t cxlflash_rrq_irq(int irq, void *data) | |
1165 | { | |
1166 | struct afu *afu = (struct afu *)data; | |
1167 | struct afu_cmd *cmd; | |
bae0ac69 MO |
1168 | struct sisl_ioasa *ioasa; |
1169 | struct sisl_ioarcb *ioarcb; | |
c21e0bbf MO |
1170 | bool toggle = afu->toggle; |
1171 | u64 entry, | |
1172 | *hrrq_start = afu->hrrq_start, | |
1173 | *hrrq_end = afu->hrrq_end, | |
1174 | *hrrq_curr = afu->hrrq_curr; | |
1175 | ||
1176 | /* Process however many RRQ entries that are ready */ | |
1177 | while (true) { | |
1178 | entry = *hrrq_curr; | |
1179 | ||
1180 | if ((entry & SISL_RESP_HANDLE_T_BIT) != toggle) | |
1181 | break; | |
1182 | ||
bae0ac69 MO |
1183 | entry &= ~SISL_RESP_HANDLE_T_BIT; |
1184 | ||
1185 | if (afu_is_sq_cmd_mode(afu)) { | |
1186 | ioasa = (struct sisl_ioasa *)entry; | |
1187 | cmd = container_of(ioasa, struct afu_cmd, sa); | |
1188 | } else { | |
1189 | ioarcb = (struct sisl_ioarcb *)entry; | |
1190 | cmd = container_of(ioarcb, struct afu_cmd, rcb); | |
1191 | } | |
1192 | ||
c21e0bbf MO |
1193 | cmd_complete(cmd); |
1194 | ||
1195 | /* Advance to next entry or wrap and flip the toggle bit */ | |
1196 | if (hrrq_curr < hrrq_end) | |
1197 | hrrq_curr++; | |
1198 | else { | |
1199 | hrrq_curr = hrrq_start; | |
1200 | toggle ^= SISL_RESP_HANDLE_T_BIT; | |
1201 | } | |
bae0ac69 MO |
1202 | |
1203 | atomic_inc(&afu->hsq_credits); | |
c21e0bbf MO |
1204 | } |
1205 | ||
1206 | afu->hrrq_curr = hrrq_curr; | |
1207 | afu->toggle = toggle; | |
1208 | ||
1209 | return IRQ_HANDLED; | |
1210 | } | |
1211 | ||
1212 | /** | |
1213 | * cxlflash_async_err_irq() - interrupt handler for asynchronous errors | |
1214 | * @irq: Interrupt number. | |
1215 | * @data: Private data provided at interrupt registration, the AFU. | |
1216 | * | |
1217 | * Return: Always return IRQ_HANDLED. | |
1218 | */ | |
1219 | static irqreturn_t cxlflash_async_err_irq(int irq, void *data) | |
1220 | { | |
1221 | struct afu *afu = (struct afu *)data; | |
4392ba49 MO |
1222 | struct cxlflash_cfg *cfg = afu->parent; |
1223 | struct device *dev = &cfg->dev->dev; | |
c21e0bbf MO |
1224 | u64 reg_unmasked; |
1225 | const struct asyc_intr_info *info; | |
1786f4a0 | 1226 | struct sisl_global_map __iomem *global = &afu->afu_map->global; |
c21e0bbf MO |
1227 | u64 reg; |
1228 | u8 port; | |
1229 | int i; | |
1230 | ||
c21e0bbf MO |
1231 | reg = readq_be(&global->regs.aintr_status); |
1232 | reg_unmasked = (reg & SISL_ASTATUS_UNMASK); | |
1233 | ||
1234 | if (reg_unmasked == 0) { | |
88d33628 | 1235 | dev_err(dev, "%s: spurious interrupt, aintr_status=%016llx\n", |
4392ba49 | 1236 | __func__, reg); |
c21e0bbf MO |
1237 | goto out; |
1238 | } | |
1239 | ||
f15fbf8d | 1240 | /* FYI, it is 'okay' to clear AFU status before FC_ERROR */ |
c21e0bbf MO |
1241 | writeq_be(reg_unmasked, &global->regs.aintr_clear); |
1242 | ||
f15fbf8d | 1243 | /* Check each bit that is on */ |
c21e0bbf MO |
1244 | for (i = 0; reg_unmasked; i++, reg_unmasked = (reg_unmasked >> 1)) { |
1245 | info = find_ainfo(1ULL << i); | |
16798d34 | 1246 | if (((reg_unmasked & 0x1) == 0) || !info) |
c21e0bbf MO |
1247 | continue; |
1248 | ||
1249 | port = info->port; | |
1250 | ||
88d33628 | 1251 | dev_err(dev, "%s: FC Port %d -> %s, fc_status=%016llx\n", |
4392ba49 | 1252 | __func__, port, info->desc, |
c21e0bbf MO |
1253 | readq_be(&global->fc_regs[port][FC_STATUS / 8])); |
1254 | ||
1255 | /* | |
f15fbf8d | 1256 | * Do link reset first, some OTHER errors will set FC_ERROR |
c21e0bbf MO |
1257 | * again if cleared before or w/o a reset |
1258 | */ | |
1259 | if (info->action & LINK_RESET) { | |
4392ba49 MO |
1260 | dev_err(dev, "%s: FC Port %d: resetting link\n", |
1261 | __func__, port); | |
c21e0bbf MO |
1262 | cfg->lr_state = LINK_RESET_REQUIRED; |
1263 | cfg->lr_port = port; | |
1264 | schedule_work(&cfg->work_q); | |
1265 | } | |
1266 | ||
1267 | if (info->action & CLR_FC_ERROR) { | |
1268 | reg = readq_be(&global->fc_regs[port][FC_ERROR / 8]); | |
1269 | ||
1270 | /* | |
f15fbf8d | 1271 | * Since all errors are unmasked, FC_ERROR and FC_ERRCAP |
c21e0bbf MO |
1272 | * should be the same and tracing one is sufficient. |
1273 | */ | |
1274 | ||
88d33628 | 1275 | dev_err(dev, "%s: fc %d: clearing fc_error=%016llx\n", |
4392ba49 | 1276 | __func__, port, reg); |
c21e0bbf MO |
1277 | |
1278 | writeq_be(reg, &global->fc_regs[port][FC_ERROR / 8]); | |
1279 | writeq_be(0, &global->fc_regs[port][FC_ERRCAP / 8]); | |
1280 | } | |
ef51074a MO |
1281 | |
1282 | if (info->action & SCAN_HOST) { | |
1283 | atomic_inc(&cfg->scan_host_needed); | |
1284 | schedule_work(&cfg->work_q); | |
1285 | } | |
c21e0bbf MO |
1286 | } |
1287 | ||
1288 | out: | |
c21e0bbf MO |
1289 | return IRQ_HANDLED; |
1290 | } | |
1291 | ||
1292 | /** | |
1293 | * start_context() - starts the master context | |
1284fb0c | 1294 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1295 | * |
1296 | * Return: A success or failure value from CXL services. | |
1297 | */ | |
1298 | static int start_context(struct cxlflash_cfg *cfg) | |
1299 | { | |
88d33628 | 1300 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
1301 | int rc = 0; |
1302 | ||
1303 | rc = cxl_start_context(cfg->mcctx, | |
1304 | cfg->afu->work.work_element_descriptor, | |
1305 | NULL); | |
1306 | ||
88d33628 | 1307 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
1308 | return rc; |
1309 | } | |
1310 | ||
1311 | /** | |
1312 | * read_vpd() - obtains the WWPNs from VPD | |
1284fb0c | 1313 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1314 | * @wwpn: Array of size NUM_FC_PORTS to pass back WWPNs |
1315 | * | |
1284fb0c | 1316 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
1317 | */ |
1318 | static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[]) | |
1319 | { | |
88d33628 MO |
1320 | struct device *dev = &cfg->dev->dev; |
1321 | struct pci_dev *pdev = cfg->dev; | |
c21e0bbf MO |
1322 | int rc = 0; |
1323 | int ro_start, ro_size, i, j, k; | |
1324 | ssize_t vpd_size; | |
1325 | char vpd_data[CXLFLASH_VPD_LEN]; | |
1326 | char tmp_buf[WWPN_BUF_LEN] = { 0 }; | |
1327 | char *wwpn_vpd_tags[NUM_FC_PORTS] = { "V5", "V6" }; | |
1328 | ||
1329 | /* Get the VPD data from the device */ | |
88d33628 | 1330 | vpd_size = cxl_read_adapter_vpd(pdev, vpd_data, sizeof(vpd_data)); |
c21e0bbf | 1331 | if (unlikely(vpd_size <= 0)) { |
88d33628 MO |
1332 | dev_err(dev, "%s: Unable to read VPD (size = %ld)\n", |
1333 | __func__, vpd_size); | |
c21e0bbf MO |
1334 | rc = -ENODEV; |
1335 | goto out; | |
1336 | } | |
1337 | ||
1338 | /* Get the read only section offset */ | |
1339 | ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, | |
1340 | PCI_VPD_LRDT_RO_DATA); | |
1341 | if (unlikely(ro_start < 0)) { | |
88d33628 | 1342 | dev_err(dev, "%s: VPD Read-only data not found\n", __func__); |
c21e0bbf MO |
1343 | rc = -ENODEV; |
1344 | goto out; | |
1345 | } | |
1346 | ||
1347 | /* Get the read only section size, cap when extends beyond read VPD */ | |
1348 | ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]); | |
1349 | j = ro_size; | |
1350 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; | |
1351 | if (unlikely((i + j) > vpd_size)) { | |
88d33628 MO |
1352 | dev_dbg(dev, "%s: Might need to read more VPD (%d > %ld)\n", |
1353 | __func__, (i + j), vpd_size); | |
c21e0bbf MO |
1354 | ro_size = vpd_size - i; |
1355 | } | |
1356 | ||
1357 | /* | |
1358 | * Find the offset of the WWPN tag within the read only | |
1359 | * VPD data and validate the found field (partials are | |
1360 | * no good to us). Convert the ASCII data to an integer | |
1361 | * value. Note that we must copy to a temporary buffer | |
1362 | * because the conversion service requires that the ASCII | |
1363 | * string be terminated. | |
1364 | */ | |
1365 | for (k = 0; k < NUM_FC_PORTS; k++) { | |
1366 | j = ro_size; | |
1367 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; | |
1368 | ||
1369 | i = pci_vpd_find_info_keyword(vpd_data, i, j, wwpn_vpd_tags[k]); | |
1370 | if (unlikely(i < 0)) { | |
88d33628 MO |
1371 | dev_err(dev, "%s: Port %d WWPN not found in VPD\n", |
1372 | __func__, k); | |
c21e0bbf MO |
1373 | rc = -ENODEV; |
1374 | goto out; | |
1375 | } | |
1376 | ||
1377 | j = pci_vpd_info_field_size(&vpd_data[i]); | |
1378 | i += PCI_VPD_INFO_FLD_HDR_SIZE; | |
1379 | if (unlikely((i + j > vpd_size) || (j != WWPN_LEN))) { | |
88d33628 MO |
1380 | dev_err(dev, "%s: Port %d WWPN incomplete or bad VPD\n", |
1381 | __func__, k); | |
c21e0bbf MO |
1382 | rc = -ENODEV; |
1383 | goto out; | |
1384 | } | |
1385 | ||
1386 | memcpy(tmp_buf, &vpd_data[i], WWPN_LEN); | |
1387 | rc = kstrtoul(tmp_buf, WWPN_LEN, (ulong *)&wwpn[k]); | |
1388 | if (unlikely(rc)) { | |
88d33628 MO |
1389 | dev_err(dev, "%s: WWPN conversion failed for port %d\n", |
1390 | __func__, k); | |
c21e0bbf MO |
1391 | rc = -ENODEV; |
1392 | goto out; | |
1393 | } | |
1394 | } | |
1395 | ||
1396 | out: | |
88d33628 | 1397 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
1398 | return rc; |
1399 | } | |
1400 | ||
1401 | /** | |
15305514 | 1402 | * init_pcr() - initialize the provisioning and control registers |
1284fb0c | 1403 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1404 | * |
15305514 MO |
1405 | * Also sets up fast access to the mapped registers and initializes AFU |
1406 | * command fields that never change. | |
c21e0bbf | 1407 | */ |
15305514 | 1408 | static void init_pcr(struct cxlflash_cfg *cfg) |
c21e0bbf MO |
1409 | { |
1410 | struct afu *afu = cfg->afu; | |
1786f4a0 | 1411 | struct sisl_ctrl_map __iomem *ctrl_map; |
c21e0bbf MO |
1412 | int i; |
1413 | ||
1414 | for (i = 0; i < MAX_CONTEXT; i++) { | |
1415 | ctrl_map = &afu->afu_map->ctrls[i].ctrl; | |
f15fbf8d MO |
1416 | /* Disrupt any clients that could be running */ |
1417 | /* e.g. clients that survived a master restart */ | |
c21e0bbf MO |
1418 | writeq_be(0, &ctrl_map->rht_start); |
1419 | writeq_be(0, &ctrl_map->rht_cnt_id); | |
1420 | writeq_be(0, &ctrl_map->ctx_cap); | |
1421 | } | |
1422 | ||
f15fbf8d | 1423 | /* Copy frequently used fields into afu */ |
c21e0bbf | 1424 | afu->ctx_hndl = (u16) cxl_process_element(cfg->mcctx); |
c21e0bbf MO |
1425 | afu->host_map = &afu->afu_map->hosts[afu->ctx_hndl].host; |
1426 | afu->ctrl_map = &afu->afu_map->ctrls[afu->ctx_hndl].ctrl; | |
1427 | ||
1428 | /* Program the Endian Control for the master context */ | |
1429 | writeq_be(SISL_ENDIAN_CTRL, &afu->host_map->endian_ctrl); | |
c21e0bbf MO |
1430 | } |
1431 | ||
1432 | /** | |
1433 | * init_global() - initialize AFU global registers | |
1284fb0c | 1434 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1435 | */ |
15305514 | 1436 | static int init_global(struct cxlflash_cfg *cfg) |
c21e0bbf MO |
1437 | { |
1438 | struct afu *afu = cfg->afu; | |
4392ba49 | 1439 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
1440 | u64 wwpn[NUM_FC_PORTS]; /* wwpn of AFU ports */ |
1441 | int i = 0, num_ports = 0; | |
1442 | int rc = 0; | |
1443 | u64 reg; | |
1444 | ||
1445 | rc = read_vpd(cfg, &wwpn[0]); | |
1446 | if (rc) { | |
4392ba49 | 1447 | dev_err(dev, "%s: could not read vpd rc=%d\n", __func__, rc); |
c21e0bbf MO |
1448 | goto out; |
1449 | } | |
1450 | ||
88d33628 MO |
1451 | dev_dbg(dev, "%s: wwpn0=%016llx wwpn1=%016llx\n", |
1452 | __func__, wwpn[0], wwpn[1]); | |
c21e0bbf | 1453 | |
bae0ac69 | 1454 | /* Set up RRQ and SQ in AFU for master issued cmds */ |
c21e0bbf MO |
1455 | writeq_be((u64) afu->hrrq_start, &afu->host_map->rrq_start); |
1456 | writeq_be((u64) afu->hrrq_end, &afu->host_map->rrq_end); | |
1457 | ||
bae0ac69 MO |
1458 | if (afu_is_sq_cmd_mode(afu)) { |
1459 | writeq_be((u64)afu->hsq_start, &afu->host_map->sq_start); | |
1460 | writeq_be((u64)afu->hsq_end, &afu->host_map->sq_end); | |
1461 | } | |
1462 | ||
c21e0bbf MO |
1463 | /* AFU configuration */ |
1464 | reg = readq_be(&afu->afu_map->global.regs.afu_config); | |
1465 | reg |= SISL_AFUCONF_AR_ALL|SISL_AFUCONF_ENDIAN; | |
1466 | /* enable all auto retry options and control endianness */ | |
1467 | /* leave others at default: */ | |
1468 | /* CTX_CAP write protected, mbox_r does not clear on read and */ | |
1469 | /* checker on if dual afu */ | |
1470 | writeq_be(reg, &afu->afu_map->global.regs.afu_config); | |
1471 | ||
f15fbf8d | 1472 | /* Global port select: select either port */ |
c21e0bbf | 1473 | if (afu->internal_lun) { |
f15fbf8d | 1474 | /* Only use port 0 */ |
c21e0bbf MO |
1475 | writeq_be(PORT0, &afu->afu_map->global.regs.afu_port_sel); |
1476 | num_ports = NUM_FC_PORTS - 1; | |
1477 | } else { | |
1478 | writeq_be(BOTH_PORTS, &afu->afu_map->global.regs.afu_port_sel); | |
1479 | num_ports = NUM_FC_PORTS; | |
1480 | } | |
1481 | ||
1482 | for (i = 0; i < num_ports; i++) { | |
f15fbf8d | 1483 | /* Unmask all errors (but they are still masked at AFU) */ |
c21e0bbf | 1484 | writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRMSK / 8]); |
f15fbf8d | 1485 | /* Clear CRC error cnt & set a threshold */ |
c21e0bbf MO |
1486 | (void)readq_be(&afu->afu_map->global. |
1487 | fc_regs[i][FC_CNT_CRCERR / 8]); | |
1488 | writeq_be(MC_CRC_THRESH, &afu->afu_map->global.fc_regs[i] | |
1489 | [FC_CRC_THRESH / 8]); | |
1490 | ||
f15fbf8d | 1491 | /* Set WWPNs. If already programmed, wwpn[i] is 0 */ |
f8013261 MO |
1492 | if (wwpn[i] != 0) |
1493 | afu_set_wwpn(afu, i, | |
1494 | &afu->afu_map->global.fc_regs[i][0], | |
1495 | wwpn[i]); | |
c21e0bbf MO |
1496 | /* Programming WWPN back to back causes additional |
1497 | * offline/online transitions and a PLOGI | |
1498 | */ | |
1499 | msleep(100); | |
c21e0bbf MO |
1500 | } |
1501 | ||
f15fbf8d MO |
1502 | /* Set up master's own CTX_CAP to allow real mode, host translation */ |
1503 | /* tables, afu cmds and read/write GSCSI cmds. */ | |
c21e0bbf MO |
1504 | /* First, unlock ctx_cap write by reading mbox */ |
1505 | (void)readq_be(&afu->ctrl_map->mbox_r); /* unlock ctx_cap */ | |
1506 | writeq_be((SISL_CTX_CAP_REAL_MODE | SISL_CTX_CAP_HOST_XLATE | | |
1507 | SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD | | |
1508 | SISL_CTX_CAP_AFU_CMD | SISL_CTX_CAP_GSCSI_CMD), | |
1509 | &afu->ctrl_map->ctx_cap); | |
f15fbf8d | 1510 | /* Initialize heartbeat */ |
c21e0bbf | 1511 | afu->hb = readq_be(&afu->afu_map->global.regs.afu_hb); |
c21e0bbf MO |
1512 | out: |
1513 | return rc; | |
1514 | } | |
1515 | ||
1516 | /** | |
1517 | * start_afu() - initializes and starts the AFU | |
1284fb0c | 1518 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1519 | */ |
1520 | static int start_afu(struct cxlflash_cfg *cfg) | |
1521 | { | |
1522 | struct afu *afu = cfg->afu; | |
88d33628 | 1523 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
1524 | int rc = 0; |
1525 | ||
c21e0bbf MO |
1526 | init_pcr(cfg); |
1527 | ||
af10483e MO |
1528 | /* After an AFU reset, RRQ entries are stale, clear them */ |
1529 | memset(&afu->rrq_entry, 0, sizeof(afu->rrq_entry)); | |
1530 | ||
f15fbf8d | 1531 | /* Initialize RRQ pointers */ |
c21e0bbf MO |
1532 | afu->hrrq_start = &afu->rrq_entry[0]; |
1533 | afu->hrrq_end = &afu->rrq_entry[NUM_RRQ_ENTRY - 1]; | |
1534 | afu->hrrq_curr = afu->hrrq_start; | |
1535 | afu->toggle = 1; | |
1536 | ||
bae0ac69 MO |
1537 | /* Initialize SQ */ |
1538 | if (afu_is_sq_cmd_mode(afu)) { | |
1539 | memset(&afu->sq, 0, sizeof(afu->sq)); | |
1540 | afu->hsq_start = &afu->sq[0]; | |
1541 | afu->hsq_end = &afu->sq[NUM_SQ_ENTRY - 1]; | |
1542 | afu->hsq_curr = afu->hsq_start; | |
1543 | ||
1544 | spin_lock_init(&afu->hsq_slock); | |
1545 | atomic_set(&afu->hsq_credits, NUM_SQ_ENTRY - 1); | |
1546 | } | |
1547 | ||
c21e0bbf MO |
1548 | rc = init_global(cfg); |
1549 | ||
88d33628 | 1550 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
1551 | return rc; |
1552 | } | |
1553 | ||
1554 | /** | |
9526f360 | 1555 | * init_intr() - setup interrupt handlers for the master context |
1284fb0c | 1556 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1557 | * |
1284fb0c | 1558 | * Return: 0 on success, -errno on failure |
c21e0bbf | 1559 | */ |
9526f360 MK |
1560 | static enum undo_level init_intr(struct cxlflash_cfg *cfg, |
1561 | struct cxl_context *ctx) | |
c21e0bbf | 1562 | { |
c21e0bbf | 1563 | struct afu *afu = cfg->afu; |
9526f360 | 1564 | struct device *dev = &cfg->dev->dev; |
c21e0bbf | 1565 | int rc = 0; |
9526f360 | 1566 | enum undo_level level = UNDO_NOOP; |
c21e0bbf MO |
1567 | |
1568 | rc = cxl_allocate_afu_irqs(ctx, 3); | |
1569 | if (unlikely(rc)) { | |
88d33628 | 1570 | dev_err(dev, "%s: allocate_afu_irqs failed rc=%d\n", |
c21e0bbf | 1571 | __func__, rc); |
9526f360 | 1572 | level = UNDO_NOOP; |
c21e0bbf MO |
1573 | goto out; |
1574 | } | |
1575 | ||
1576 | rc = cxl_map_afu_irq(ctx, 1, cxlflash_sync_err_irq, afu, | |
1577 | "SISL_MSI_SYNC_ERROR"); | |
1578 | if (unlikely(rc <= 0)) { | |
88d33628 | 1579 | dev_err(dev, "%s: SISL_MSI_SYNC_ERROR map failed\n", __func__); |
c21e0bbf MO |
1580 | level = FREE_IRQ; |
1581 | goto out; | |
1582 | } | |
1583 | ||
1584 | rc = cxl_map_afu_irq(ctx, 2, cxlflash_rrq_irq, afu, | |
1585 | "SISL_MSI_RRQ_UPDATED"); | |
1586 | if (unlikely(rc <= 0)) { | |
88d33628 | 1587 | dev_err(dev, "%s: SISL_MSI_RRQ_UPDATED map failed\n", __func__); |
c21e0bbf MO |
1588 | level = UNMAP_ONE; |
1589 | goto out; | |
1590 | } | |
1591 | ||
1592 | rc = cxl_map_afu_irq(ctx, 3, cxlflash_async_err_irq, afu, | |
1593 | "SISL_MSI_ASYNC_ERROR"); | |
1594 | if (unlikely(rc <= 0)) { | |
88d33628 | 1595 | dev_err(dev, "%s: SISL_MSI_ASYNC_ERROR map failed\n", __func__); |
c21e0bbf MO |
1596 | level = UNMAP_TWO; |
1597 | goto out; | |
1598 | } | |
9526f360 MK |
1599 | out: |
1600 | return level; | |
1601 | } | |
c21e0bbf | 1602 | |
9526f360 MK |
1603 | /** |
1604 | * init_mc() - create and register as the master context | |
1605 | * @cfg: Internal structure associated with the host. | |
1606 | * | |
1607 | * Return: 0 on success, -errno on failure | |
1608 | */ | |
1609 | static int init_mc(struct cxlflash_cfg *cfg) | |
1610 | { | |
1611 | struct cxl_context *ctx; | |
1612 | struct device *dev = &cfg->dev->dev; | |
1613 | int rc = 0; | |
1614 | enum undo_level level; | |
1615 | ||
1616 | ctx = cxl_get_context(cfg->dev); | |
1617 | if (unlikely(!ctx)) { | |
1618 | rc = -ENOMEM; | |
1619 | goto ret; | |
1620 | } | |
1621 | cfg->mcctx = ctx; | |
1622 | ||
1623 | /* Set it up as a master with the CXL */ | |
1624 | cxl_set_master(ctx); | |
1625 | ||
1626 | /* During initialization reset the AFU to start from a clean slate */ | |
1627 | rc = cxl_afu_reset(cfg->mcctx); | |
1628 | if (unlikely(rc)) { | |
88d33628 | 1629 | dev_err(dev, "%s: AFU reset failed rc=%d\n", __func__, rc); |
9526f360 MK |
1630 | goto ret; |
1631 | } | |
1632 | ||
1633 | level = init_intr(cfg, ctx); | |
1634 | if (unlikely(level)) { | |
88d33628 | 1635 | dev_err(dev, "%s: interrupt init failed rc=%d\n", __func__, rc); |
9526f360 MK |
1636 | goto out; |
1637 | } | |
c21e0bbf MO |
1638 | |
1639 | /* This performs the equivalent of the CXL_IOCTL_START_WORK. | |
1640 | * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process | |
1641 | * element (pe) that is embedded in the context (ctx) | |
1642 | */ | |
1643 | rc = start_context(cfg); | |
1644 | if (unlikely(rc)) { | |
1645 | dev_err(dev, "%s: start context failed rc=%d\n", __func__, rc); | |
1646 | level = UNMAP_THREE; | |
1647 | goto out; | |
1648 | } | |
1649 | ret: | |
88d33628 | 1650 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
1651 | return rc; |
1652 | out: | |
9526f360 | 1653 | term_intr(cfg, level); |
c21e0bbf MO |
1654 | goto ret; |
1655 | } | |
1656 | ||
1657 | /** | |
1658 | * init_afu() - setup as master context and start AFU | |
1284fb0c | 1659 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1660 | * |
1661 | * This routine is a higher level of control for configuring the | |
1662 | * AFU on probe and reset paths. | |
1663 | * | |
1284fb0c | 1664 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
1665 | */ |
1666 | static int init_afu(struct cxlflash_cfg *cfg) | |
1667 | { | |
1668 | u64 reg; | |
1669 | int rc = 0; | |
1670 | struct afu *afu = cfg->afu; | |
1671 | struct device *dev = &cfg->dev->dev; | |
1672 | ||
5cdac81a MO |
1673 | cxl_perst_reloads_same_image(cfg->cxl_afu, true); |
1674 | ||
c21e0bbf MO |
1675 | rc = init_mc(cfg); |
1676 | if (rc) { | |
88d33628 | 1677 | dev_err(dev, "%s: init_mc failed rc=%d\n", |
c21e0bbf | 1678 | __func__, rc); |
ee3491ba | 1679 | goto out; |
c21e0bbf MO |
1680 | } |
1681 | ||
f15fbf8d | 1682 | /* Map the entire MMIO space of the AFU */ |
c21e0bbf MO |
1683 | afu->afu_map = cxl_psa_map(cfg->mcctx); |
1684 | if (!afu->afu_map) { | |
88d33628 | 1685 | dev_err(dev, "%s: cxl_psa_map failed\n", __func__); |
ee3491ba | 1686 | rc = -ENOMEM; |
c21e0bbf MO |
1687 | goto err1; |
1688 | } | |
1689 | ||
e5ce067b MO |
1690 | /* No byte reverse on reading afu_version or string will be backwards */ |
1691 | reg = readq(&afu->afu_map->global.regs.afu_version); | |
1692 | memcpy(afu->version, ®, sizeof(reg)); | |
c21e0bbf MO |
1693 | afu->interface_version = |
1694 | readq_be(&afu->afu_map->global.regs.interface_version); | |
e5ce067b | 1695 | if ((afu->interface_version + 1) == 0) { |
88d33628 MO |
1696 | dev_err(dev, "Back level AFU, please upgrade. AFU version %s " |
1697 | "interface version %016llx\n", afu->version, | |
e5ce067b MO |
1698 | afu->interface_version); |
1699 | rc = -EINVAL; | |
d940f9ae | 1700 | goto err1; |
ee3491ba MO |
1701 | } |
1702 | ||
bae0ac69 MO |
1703 | if (afu_is_sq_cmd_mode(afu)) { |
1704 | afu->send_cmd = send_cmd_sq; | |
1705 | afu->context_reset = context_reset_sq; | |
1706 | } else { | |
1707 | afu->send_cmd = send_cmd_ioarrin; | |
1708 | afu->context_reset = context_reset_ioarrin; | |
1709 | } | |
48b4be36 | 1710 | |
88d33628 MO |
1711 | dev_dbg(dev, "%s: afu_ver=%s interface_ver=%016llx\n", __func__, |
1712 | afu->version, afu->interface_version); | |
c21e0bbf MO |
1713 | |
1714 | rc = start_afu(cfg); | |
1715 | if (rc) { | |
88d33628 | 1716 | dev_err(dev, "%s: start_afu failed, rc=%d\n", __func__, rc); |
d940f9ae | 1717 | goto err1; |
c21e0bbf MO |
1718 | } |
1719 | ||
1720 | afu_err_intr_init(cfg->afu); | |
11f7b184 UK |
1721 | spin_lock_init(&afu->rrin_slock); |
1722 | afu->room = readq_be(&afu->host_map->cmd_room); | |
c21e0bbf | 1723 | |
2cb79266 MO |
1724 | /* Restore the LUN mappings */ |
1725 | cxlflash_restore_luntable(cfg); | |
ee3491ba | 1726 | out: |
88d33628 | 1727 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf | 1728 | return rc; |
ee3491ba | 1729 | |
ee3491ba | 1730 | err1: |
9526f360 MK |
1731 | term_intr(cfg, UNMAP_THREE); |
1732 | term_mc(cfg); | |
ee3491ba | 1733 | goto out; |
c21e0bbf MO |
1734 | } |
1735 | ||
c21e0bbf MO |
1736 | /** |
1737 | * cxlflash_afu_sync() - builds and sends an AFU sync command | |
1738 | * @afu: AFU associated with the host. | |
1739 | * @ctx_hndl_u: Identifies context requesting sync. | |
1740 | * @res_hndl_u: Identifies resource requesting sync. | |
1741 | * @mode: Type of sync to issue (lightweight, heavyweight, global). | |
1742 | * | |
1743 | * The AFU can only take 1 sync command at a time. This routine enforces this | |
f15fbf8d | 1744 | * limitation by using a mutex to provide exclusive access to the AFU during |
c21e0bbf MO |
1745 | * the sync. This design point requires calling threads to not be on interrupt |
1746 | * context due to the possibility of sleeping during concurrent sync operations. | |
1747 | * | |
5cdac81a MO |
1748 | * AFU sync operations are only necessary and allowed when the device is |
1749 | * operating normally. When not operating normally, sync requests can occur as | |
1750 | * part of cleaning up resources associated with an adapter prior to removal. | |
1751 | * In this scenario, these requests are simply ignored (safe due to the AFU | |
1752 | * going away). | |
1753 | * | |
c21e0bbf MO |
1754 | * Return: |
1755 | * 0 on success | |
1756 | * -1 on failure | |
1757 | */ | |
1758 | int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t ctx_hndl_u, | |
1759 | res_hndl_t res_hndl_u, u8 mode) | |
1760 | { | |
5cdac81a | 1761 | struct cxlflash_cfg *cfg = afu->parent; |
4392ba49 | 1762 | struct device *dev = &cfg->dev->dev; |
c21e0bbf | 1763 | struct afu_cmd *cmd = NULL; |
350bb478 | 1764 | char *buf = NULL; |
c21e0bbf | 1765 | int rc = 0; |
c21e0bbf MO |
1766 | static DEFINE_MUTEX(sync_active); |
1767 | ||
5cdac81a | 1768 | if (cfg->state != STATE_NORMAL) { |
88d33628 MO |
1769 | dev_dbg(dev, "%s: Sync not required state=%u\n", |
1770 | __func__, cfg->state); | |
5cdac81a MO |
1771 | return 0; |
1772 | } | |
1773 | ||
c21e0bbf | 1774 | mutex_lock(&sync_active); |
de01283b | 1775 | atomic_inc(&afu->cmds_active); |
350bb478 MO |
1776 | buf = kzalloc(sizeof(*cmd) + __alignof__(*cmd) - 1, GFP_KERNEL); |
1777 | if (unlikely(!buf)) { | |
1778 | dev_err(dev, "%s: no memory for command\n", __func__); | |
c21e0bbf MO |
1779 | rc = -1; |
1780 | goto out; | |
1781 | } | |
1782 | ||
350bb478 MO |
1783 | cmd = (struct afu_cmd *)PTR_ALIGN(buf, __alignof__(*cmd)); |
1784 | init_completion(&cmd->cevent); | |
350bb478 | 1785 | cmd->parent = afu; |
c21e0bbf | 1786 | |
88d33628 | 1787 | dev_dbg(dev, "%s: afu=%p cmd=%p %d\n", __func__, afu, cmd, ctx_hndl_u); |
c21e0bbf MO |
1788 | |
1789 | cmd->rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD; | |
350bb478 MO |
1790 | cmd->rcb.ctx_id = afu->ctx_hndl; |
1791 | cmd->rcb.msi = SISL_MSI_RRQ_UPDATED; | |
c21e0bbf MO |
1792 | cmd->rcb.timeout = MC_AFU_SYNC_TIMEOUT; |
1793 | ||
1794 | cmd->rcb.cdb[0] = 0xC0; /* AFU Sync */ | |
1795 | cmd->rcb.cdb[1] = mode; | |
1796 | ||
1797 | /* The cdb is aligned, no unaligned accessors required */ | |
1786f4a0 MO |
1798 | *((__be16 *)&cmd->rcb.cdb[2]) = cpu_to_be16(ctx_hndl_u); |
1799 | *((__be32 *)&cmd->rcb.cdb[4]) = cpu_to_be32(res_hndl_u); | |
c21e0bbf | 1800 | |
48b4be36 | 1801 | rc = afu->send_cmd(afu, cmd); |
c21e0bbf MO |
1802 | if (unlikely(rc)) |
1803 | goto out; | |
1804 | ||
9ba848ac MO |
1805 | rc = wait_resp(afu, cmd); |
1806 | if (unlikely(rc)) | |
c21e0bbf MO |
1807 | rc = -1; |
1808 | out: | |
de01283b | 1809 | atomic_dec(&afu->cmds_active); |
c21e0bbf | 1810 | mutex_unlock(&sync_active); |
350bb478 | 1811 | kfree(buf); |
88d33628 | 1812 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
1813 | return rc; |
1814 | } | |
1815 | ||
1816 | /** | |
15305514 MO |
1817 | * afu_reset() - resets the AFU |
1818 | * @cfg: Internal structure associated with the host. | |
c21e0bbf | 1819 | * |
1284fb0c | 1820 | * Return: 0 on success, -errno on failure |
c21e0bbf | 1821 | */ |
15305514 | 1822 | static int afu_reset(struct cxlflash_cfg *cfg) |
c21e0bbf | 1823 | { |
88d33628 | 1824 | struct device *dev = &cfg->dev->dev; |
c21e0bbf | 1825 | int rc = 0; |
88d33628 | 1826 | |
c21e0bbf MO |
1827 | /* Stop the context before the reset. Since the context is |
1828 | * no longer available restart it after the reset is complete | |
1829 | */ | |
c21e0bbf MO |
1830 | term_afu(cfg); |
1831 | ||
1832 | rc = init_afu(cfg); | |
1833 | ||
88d33628 | 1834 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
1835 | return rc; |
1836 | } | |
1837 | ||
f411396d MK |
1838 | /** |
1839 | * drain_ioctls() - wait until all currently executing ioctls have completed | |
1840 | * @cfg: Internal structure associated with the host. | |
1841 | * | |
1842 | * Obtain write access to read/write semaphore that wraps ioctl | |
1843 | * handling to 'drain' ioctls currently executing. | |
1844 | */ | |
1845 | static void drain_ioctls(struct cxlflash_cfg *cfg) | |
1846 | { | |
1847 | down_write(&cfg->ioctl_rwsem); | |
1848 | up_write(&cfg->ioctl_rwsem); | |
1849 | } | |
1850 | ||
15305514 MO |
1851 | /** |
1852 | * cxlflash_eh_device_reset_handler() - reset a single LUN | |
1853 | * @scp: SCSI command to send. | |
1854 | * | |
1855 | * Return: | |
1856 | * SUCCESS as defined in scsi/scsi.h | |
1857 | * FAILED as defined in scsi/scsi.h | |
1858 | */ | |
1859 | static int cxlflash_eh_device_reset_handler(struct scsi_cmnd *scp) | |
1860 | { | |
1861 | int rc = SUCCESS; | |
1862 | struct Scsi_Host *host = scp->device->host; | |
88d33628 MO |
1863 | struct cxlflash_cfg *cfg = shost_priv(host); |
1864 | struct device *dev = &cfg->dev->dev; | |
15305514 MO |
1865 | struct afu *afu = cfg->afu; |
1866 | int rcr = 0; | |
1867 | ||
88d33628 MO |
1868 | dev_dbg(dev, "%s: (scp=%p) %d/%d/%d/%llu " |
1869 | "cdb=(%08x-%08x-%08x-%08x)\n", __func__, scp, host->host_no, | |
1870 | scp->device->channel, scp->device->id, scp->device->lun, | |
1871 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
1872 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
1873 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
1874 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
15305514 | 1875 | |
ed486daa | 1876 | retry: |
15305514 MO |
1877 | switch (cfg->state) { |
1878 | case STATE_NORMAL: | |
1879 | rcr = send_tmf(afu, scp, TMF_LUN_RESET); | |
1880 | if (unlikely(rcr)) | |
1881 | rc = FAILED; | |
1882 | break; | |
1883 | case STATE_RESET: | |
1884 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); | |
ed486daa | 1885 | goto retry; |
15305514 MO |
1886 | default: |
1887 | rc = FAILED; | |
1888 | break; | |
1889 | } | |
1890 | ||
88d33628 | 1891 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
15305514 MO |
1892 | return rc; |
1893 | } | |
1894 | ||
1895 | /** | |
1896 | * cxlflash_eh_host_reset_handler() - reset the host adapter | |
1897 | * @scp: SCSI command from stack identifying host. | |
1898 | * | |
1d3324c3 MO |
1899 | * Following a reset, the state is evaluated again in case an EEH occurred |
1900 | * during the reset. In such a scenario, the host reset will either yield | |
1901 | * until the EEH recovery is complete or return success or failure based | |
1902 | * upon the current device state. | |
1903 | * | |
15305514 MO |
1904 | * Return: |
1905 | * SUCCESS as defined in scsi/scsi.h | |
1906 | * FAILED as defined in scsi/scsi.h | |
1907 | */ | |
1908 | static int cxlflash_eh_host_reset_handler(struct scsi_cmnd *scp) | |
1909 | { | |
1910 | int rc = SUCCESS; | |
1911 | int rcr = 0; | |
1912 | struct Scsi_Host *host = scp->device->host; | |
88d33628 MO |
1913 | struct cxlflash_cfg *cfg = shost_priv(host); |
1914 | struct device *dev = &cfg->dev->dev; | |
15305514 | 1915 | |
88d33628 MO |
1916 | dev_dbg(dev, "%s: (scp=%p) %d/%d/%d/%llu " |
1917 | "cdb=(%08x-%08x-%08x-%08x)\n", __func__, scp, host->host_no, | |
1918 | scp->device->channel, scp->device->id, scp->device->lun, | |
1919 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
1920 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
1921 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
1922 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
15305514 MO |
1923 | |
1924 | switch (cfg->state) { | |
1925 | case STATE_NORMAL: | |
1926 | cfg->state = STATE_RESET; | |
f411396d | 1927 | drain_ioctls(cfg); |
15305514 MO |
1928 | cxlflash_mark_contexts_error(cfg); |
1929 | rcr = afu_reset(cfg); | |
1930 | if (rcr) { | |
1931 | rc = FAILED; | |
1932 | cfg->state = STATE_FAILTERM; | |
1933 | } else | |
1934 | cfg->state = STATE_NORMAL; | |
1935 | wake_up_all(&cfg->reset_waitq); | |
1d3324c3 MO |
1936 | ssleep(1); |
1937 | /* fall through */ | |
15305514 MO |
1938 | case STATE_RESET: |
1939 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); | |
1940 | if (cfg->state == STATE_NORMAL) | |
1941 | break; | |
1942 | /* fall through */ | |
1943 | default: | |
1944 | rc = FAILED; | |
1945 | break; | |
1946 | } | |
1947 | ||
88d33628 | 1948 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
15305514 MO |
1949 | return rc; |
1950 | } | |
1951 | ||
1952 | /** | |
1953 | * cxlflash_change_queue_depth() - change the queue depth for the device | |
1954 | * @sdev: SCSI device destined for queue depth change. | |
1955 | * @qdepth: Requested queue depth value to set. | |
1956 | * | |
1957 | * The requested queue depth is capped to the maximum supported value. | |
1958 | * | |
1959 | * Return: The actual queue depth set. | |
1960 | */ | |
1961 | static int cxlflash_change_queue_depth(struct scsi_device *sdev, int qdepth) | |
1962 | { | |
1963 | ||
1964 | if (qdepth > CXLFLASH_MAX_CMDS_PER_LUN) | |
1965 | qdepth = CXLFLASH_MAX_CMDS_PER_LUN; | |
1966 | ||
1967 | scsi_change_queue_depth(sdev, qdepth); | |
1968 | return sdev->queue_depth; | |
1969 | } | |
1970 | ||
1971 | /** | |
1972 | * cxlflash_show_port_status() - queries and presents the current port status | |
e0f01a21 MO |
1973 | * @port: Desired port for status reporting. |
1974 | * @afu: AFU owning the specified port. | |
15305514 MO |
1975 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. |
1976 | * | |
1977 | * Return: The size of the ASCII string returned in @buf. | |
1978 | */ | |
e0f01a21 | 1979 | static ssize_t cxlflash_show_port_status(u32 port, struct afu *afu, char *buf) |
15305514 | 1980 | { |
15305514 | 1981 | char *disp_status; |
15305514 | 1982 | u64 status; |
e0f01a21 | 1983 | __be64 __iomem *fc_regs; |
15305514 | 1984 | |
e0f01a21 | 1985 | if (port >= NUM_FC_PORTS) |
15305514 MO |
1986 | return 0; |
1987 | ||
1988 | fc_regs = &afu->afu_map->global.fc_regs[port][0]; | |
e0f01a21 MO |
1989 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); |
1990 | status &= FC_MTIP_STATUS_MASK; | |
15305514 MO |
1991 | |
1992 | if (status == FC_MTIP_STATUS_ONLINE) | |
1993 | disp_status = "online"; | |
1994 | else if (status == FC_MTIP_STATUS_OFFLINE) | |
1995 | disp_status = "offline"; | |
1996 | else | |
1997 | disp_status = "unknown"; | |
1998 | ||
e0f01a21 MO |
1999 | return scnprintf(buf, PAGE_SIZE, "%s\n", disp_status); |
2000 | } | |
2001 | ||
2002 | /** | |
2003 | * port0_show() - queries and presents the current status of port 0 | |
2004 | * @dev: Generic device associated with the host owning the port. | |
2005 | * @attr: Device attribute representing the port. | |
2006 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2007 | * | |
2008 | * Return: The size of the ASCII string returned in @buf. | |
2009 | */ | |
2010 | static ssize_t port0_show(struct device *dev, | |
2011 | struct device_attribute *attr, | |
2012 | char *buf) | |
2013 | { | |
88d33628 | 2014 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); |
e0f01a21 MO |
2015 | struct afu *afu = cfg->afu; |
2016 | ||
2017 | return cxlflash_show_port_status(0, afu, buf); | |
15305514 MO |
2018 | } |
2019 | ||
2020 | /** | |
e0f01a21 MO |
2021 | * port1_show() - queries and presents the current status of port 1 |
2022 | * @dev: Generic device associated with the host owning the port. | |
2023 | * @attr: Device attribute representing the port. | |
2024 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2025 | * | |
2026 | * Return: The size of the ASCII string returned in @buf. | |
2027 | */ | |
2028 | static ssize_t port1_show(struct device *dev, | |
2029 | struct device_attribute *attr, | |
2030 | char *buf) | |
2031 | { | |
88d33628 | 2032 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); |
e0f01a21 MO |
2033 | struct afu *afu = cfg->afu; |
2034 | ||
2035 | return cxlflash_show_port_status(1, afu, buf); | |
2036 | } | |
2037 | ||
2038 | /** | |
2039 | * lun_mode_show() - presents the current LUN mode of the host | |
15305514 | 2040 | * @dev: Generic device associated with the host. |
e0f01a21 | 2041 | * @attr: Device attribute representing the LUN mode. |
15305514 MO |
2042 | * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII. |
2043 | * | |
2044 | * Return: The size of the ASCII string returned in @buf. | |
2045 | */ | |
e0f01a21 MO |
2046 | static ssize_t lun_mode_show(struct device *dev, |
2047 | struct device_attribute *attr, char *buf) | |
15305514 | 2048 | { |
88d33628 | 2049 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); |
15305514 MO |
2050 | struct afu *afu = cfg->afu; |
2051 | ||
e0f01a21 | 2052 | return scnprintf(buf, PAGE_SIZE, "%u\n", afu->internal_lun); |
15305514 MO |
2053 | } |
2054 | ||
2055 | /** | |
e0f01a21 | 2056 | * lun_mode_store() - sets the LUN mode of the host |
15305514 | 2057 | * @dev: Generic device associated with the host. |
e0f01a21 | 2058 | * @attr: Device attribute representing the LUN mode. |
15305514 MO |
2059 | * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII. |
2060 | * @count: Length of data resizing in @buf. | |
2061 | * | |
2062 | * The CXL Flash AFU supports a dummy LUN mode where the external | |
2063 | * links and storage are not required. Space on the FPGA is used | |
2064 | * to create 1 or 2 small LUNs which are presented to the system | |
2065 | * as if they were a normal storage device. This feature is useful | |
2066 | * during development and also provides manufacturing with a way | |
2067 | * to test the AFU without an actual device. | |
2068 | * | |
2069 | * 0 = external LUN[s] (default) | |
2070 | * 1 = internal LUN (1 x 64K, 512B blocks, id 0) | |
2071 | * 2 = internal LUN (1 x 64K, 4K blocks, id 0) | |
2072 | * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1) | |
2073 | * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1) | |
2074 | * | |
2075 | * Return: The size of the ASCII string returned in @buf. | |
2076 | */ | |
e0f01a21 MO |
2077 | static ssize_t lun_mode_store(struct device *dev, |
2078 | struct device_attribute *attr, | |
2079 | const char *buf, size_t count) | |
15305514 MO |
2080 | { |
2081 | struct Scsi_Host *shost = class_to_shost(dev); | |
88d33628 | 2082 | struct cxlflash_cfg *cfg = shost_priv(shost); |
15305514 MO |
2083 | struct afu *afu = cfg->afu; |
2084 | int rc; | |
2085 | u32 lun_mode; | |
2086 | ||
2087 | rc = kstrtouint(buf, 10, &lun_mode); | |
2088 | if (!rc && (lun_mode < 5) && (lun_mode != afu->internal_lun)) { | |
2089 | afu->internal_lun = lun_mode; | |
603ecce9 MK |
2090 | |
2091 | /* | |
2092 | * When configured for internal LUN, there is only one channel, | |
2093 | * channel number 0, else there will be 2 (default). | |
2094 | */ | |
2095 | if (afu->internal_lun) | |
2096 | shost->max_channel = 0; | |
2097 | else | |
2098 | shost->max_channel = NUM_FC_PORTS - 1; | |
2099 | ||
15305514 MO |
2100 | afu_reset(cfg); |
2101 | scsi_scan_host(cfg->host); | |
2102 | } | |
2103 | ||
2104 | return count; | |
2105 | } | |
2106 | ||
2107 | /** | |
e0f01a21 | 2108 | * ioctl_version_show() - presents the current ioctl version of the host |
15305514 MO |
2109 | * @dev: Generic device associated with the host. |
2110 | * @attr: Device attribute representing the ioctl version. | |
2111 | * @buf: Buffer of length PAGE_SIZE to report back the ioctl version. | |
2112 | * | |
2113 | * Return: The size of the ASCII string returned in @buf. | |
2114 | */ | |
e0f01a21 MO |
2115 | static ssize_t ioctl_version_show(struct device *dev, |
2116 | struct device_attribute *attr, char *buf) | |
15305514 MO |
2117 | { |
2118 | return scnprintf(buf, PAGE_SIZE, "%u\n", DK_CXLFLASH_VERSION_0); | |
2119 | } | |
2120 | ||
2121 | /** | |
e0f01a21 MO |
2122 | * cxlflash_show_port_lun_table() - queries and presents the port LUN table |
2123 | * @port: Desired port for status reporting. | |
2124 | * @afu: AFU owning the specified port. | |
2125 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2126 | * | |
2127 | * Return: The size of the ASCII string returned in @buf. | |
2128 | */ | |
2129 | static ssize_t cxlflash_show_port_lun_table(u32 port, | |
2130 | struct afu *afu, | |
2131 | char *buf) | |
2132 | { | |
2133 | int i; | |
2134 | ssize_t bytes = 0; | |
2135 | __be64 __iomem *fc_port; | |
2136 | ||
2137 | if (port >= NUM_FC_PORTS) | |
2138 | return 0; | |
2139 | ||
2140 | fc_port = &afu->afu_map->global.fc_port[port][0]; | |
2141 | ||
2142 | for (i = 0; i < CXLFLASH_NUM_VLUNS; i++) | |
2143 | bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes, | |
88d33628 | 2144 | "%03d: %016llx\n", i, readq_be(&fc_port[i])); |
e0f01a21 MO |
2145 | return bytes; |
2146 | } | |
2147 | ||
2148 | /** | |
2149 | * port0_lun_table_show() - presents the current LUN table of port 0 | |
2150 | * @dev: Generic device associated with the host owning the port. | |
2151 | * @attr: Device attribute representing the port. | |
2152 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2153 | * | |
2154 | * Return: The size of the ASCII string returned in @buf. | |
2155 | */ | |
2156 | static ssize_t port0_lun_table_show(struct device *dev, | |
2157 | struct device_attribute *attr, | |
2158 | char *buf) | |
2159 | { | |
88d33628 | 2160 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); |
e0f01a21 MO |
2161 | struct afu *afu = cfg->afu; |
2162 | ||
2163 | return cxlflash_show_port_lun_table(0, afu, buf); | |
2164 | } | |
2165 | ||
2166 | /** | |
2167 | * port1_lun_table_show() - presents the current LUN table of port 1 | |
2168 | * @dev: Generic device associated with the host owning the port. | |
2169 | * @attr: Device attribute representing the port. | |
2170 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2171 | * | |
2172 | * Return: The size of the ASCII string returned in @buf. | |
2173 | */ | |
2174 | static ssize_t port1_lun_table_show(struct device *dev, | |
2175 | struct device_attribute *attr, | |
2176 | char *buf) | |
2177 | { | |
88d33628 | 2178 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); |
e0f01a21 MO |
2179 | struct afu *afu = cfg->afu; |
2180 | ||
2181 | return cxlflash_show_port_lun_table(1, afu, buf); | |
2182 | } | |
2183 | ||
2184 | /** | |
2185 | * mode_show() - presents the current mode of the device | |
15305514 MO |
2186 | * @dev: Generic device associated with the device. |
2187 | * @attr: Device attribute representing the device mode. | |
2188 | * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII. | |
2189 | * | |
2190 | * Return: The size of the ASCII string returned in @buf. | |
2191 | */ | |
e0f01a21 MO |
2192 | static ssize_t mode_show(struct device *dev, |
2193 | struct device_attribute *attr, char *buf) | |
15305514 MO |
2194 | { |
2195 | struct scsi_device *sdev = to_scsi_device(dev); | |
2196 | ||
e0f01a21 MO |
2197 | return scnprintf(buf, PAGE_SIZE, "%s\n", |
2198 | sdev->hostdata ? "superpipe" : "legacy"); | |
15305514 MO |
2199 | } |
2200 | ||
2201 | /* | |
2202 | * Host attributes | |
2203 | */ | |
e0f01a21 MO |
2204 | static DEVICE_ATTR_RO(port0); |
2205 | static DEVICE_ATTR_RO(port1); | |
2206 | static DEVICE_ATTR_RW(lun_mode); | |
2207 | static DEVICE_ATTR_RO(ioctl_version); | |
2208 | static DEVICE_ATTR_RO(port0_lun_table); | |
2209 | static DEVICE_ATTR_RO(port1_lun_table); | |
15305514 MO |
2210 | |
2211 | static struct device_attribute *cxlflash_host_attrs[] = { | |
2212 | &dev_attr_port0, | |
2213 | &dev_attr_port1, | |
2214 | &dev_attr_lun_mode, | |
2215 | &dev_attr_ioctl_version, | |
e0f01a21 MO |
2216 | &dev_attr_port0_lun_table, |
2217 | &dev_attr_port1_lun_table, | |
15305514 MO |
2218 | NULL |
2219 | }; | |
2220 | ||
2221 | /* | |
2222 | * Device attributes | |
2223 | */ | |
e0f01a21 | 2224 | static DEVICE_ATTR_RO(mode); |
15305514 MO |
2225 | |
2226 | static struct device_attribute *cxlflash_dev_attrs[] = { | |
2227 | &dev_attr_mode, | |
2228 | NULL | |
2229 | }; | |
2230 | ||
2231 | /* | |
2232 | * Host template | |
2233 | */ | |
2234 | static struct scsi_host_template driver_template = { | |
2235 | .module = THIS_MODULE, | |
2236 | .name = CXLFLASH_ADAPTER_NAME, | |
2237 | .info = cxlflash_driver_info, | |
2238 | .ioctl = cxlflash_ioctl, | |
2239 | .proc_name = CXLFLASH_NAME, | |
2240 | .queuecommand = cxlflash_queuecommand, | |
2241 | .eh_device_reset_handler = cxlflash_eh_device_reset_handler, | |
2242 | .eh_host_reset_handler = cxlflash_eh_host_reset_handler, | |
2243 | .change_queue_depth = cxlflash_change_queue_depth, | |
83430833 | 2244 | .cmd_per_lun = CXLFLASH_MAX_CMDS_PER_LUN, |
15305514 | 2245 | .can_queue = CXLFLASH_MAX_CMDS, |
5fbb96c8 | 2246 | .cmd_size = sizeof(struct afu_cmd) + __alignof__(struct afu_cmd) - 1, |
15305514 | 2247 | .this_id = -1, |
68ab2d76 | 2248 | .sg_tablesize = 1, /* No scatter gather support */ |
15305514 MO |
2249 | .max_sectors = CXLFLASH_MAX_SECTORS, |
2250 | .use_clustering = ENABLE_CLUSTERING, | |
2251 | .shost_attrs = cxlflash_host_attrs, | |
2252 | .sdev_attrs = cxlflash_dev_attrs, | |
2253 | }; | |
2254 | ||
2255 | /* | |
2256 | * Device dependent values | |
2257 | */ | |
96e1b660 UK |
2258 | static struct dev_dependent_vals dev_corsa_vals = { CXLFLASH_MAX_SECTORS, |
2259 | 0ULL }; | |
2260 | static struct dev_dependent_vals dev_flash_gt_vals = { CXLFLASH_MAX_SECTORS, | |
704c4b0d | 2261 | CXLFLASH_NOTIFY_SHUTDOWN }; |
15305514 MO |
2262 | |
2263 | /* | |
2264 | * PCI device binding table | |
2265 | */ | |
2266 | static struct pci_device_id cxlflash_pci_table[] = { | |
2267 | {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CORSA, | |
2268 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_corsa_vals}, | |
a2746fb1 MK |
2269 | {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_FLASH_GT, |
2270 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_flash_gt_vals}, | |
15305514 MO |
2271 | {} |
2272 | }; | |
2273 | ||
2274 | MODULE_DEVICE_TABLE(pci, cxlflash_pci_table); | |
2275 | ||
c21e0bbf MO |
2276 | /** |
2277 | * cxlflash_worker_thread() - work thread handler for the AFU | |
2278 | * @work: Work structure contained within cxlflash associated with host. | |
2279 | * | |
2280 | * Handles the following events: | |
2281 | * - Link reset which cannot be performed on interrupt context due to | |
2282 | * blocking up to a few seconds | |
ef51074a | 2283 | * - Rescan the host |
c21e0bbf MO |
2284 | */ |
2285 | static void cxlflash_worker_thread(struct work_struct *work) | |
2286 | { | |
5cdac81a MO |
2287 | struct cxlflash_cfg *cfg = container_of(work, struct cxlflash_cfg, |
2288 | work_q); | |
c21e0bbf | 2289 | struct afu *afu = cfg->afu; |
4392ba49 | 2290 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
2291 | int port; |
2292 | ulong lock_flags; | |
2293 | ||
5cdac81a MO |
2294 | /* Avoid MMIO if the device has failed */ |
2295 | ||
2296 | if (cfg->state != STATE_NORMAL) | |
2297 | return; | |
2298 | ||
c21e0bbf MO |
2299 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); |
2300 | ||
2301 | if (cfg->lr_state == LINK_RESET_REQUIRED) { | |
2302 | port = cfg->lr_port; | |
2303 | if (port < 0) | |
4392ba49 MO |
2304 | dev_err(dev, "%s: invalid port index %d\n", |
2305 | __func__, port); | |
c21e0bbf MO |
2306 | else { |
2307 | spin_unlock_irqrestore(cfg->host->host_lock, | |
2308 | lock_flags); | |
2309 | ||
2310 | /* The reset can block... */ | |
2311 | afu_link_reset(afu, port, | |
f15fbf8d | 2312 | &afu->afu_map->global.fc_regs[port][0]); |
c21e0bbf MO |
2313 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); |
2314 | } | |
2315 | ||
2316 | cfg->lr_state = LINK_RESET_COMPLETE; | |
2317 | } | |
2318 | ||
c21e0bbf | 2319 | spin_unlock_irqrestore(cfg->host->host_lock, lock_flags); |
ef51074a MO |
2320 | |
2321 | if (atomic_dec_if_positive(&cfg->scan_host_needed) >= 0) | |
2322 | scsi_scan_host(cfg->host); | |
c21e0bbf MO |
2323 | } |
2324 | ||
2325 | /** | |
2326 | * cxlflash_probe() - PCI entry point to add host | |
2327 | * @pdev: PCI device associated with the host. | |
2328 | * @dev_id: PCI device id associated with device. | |
2329 | * | |
1284fb0c | 2330 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
2331 | */ |
2332 | static int cxlflash_probe(struct pci_dev *pdev, | |
2333 | const struct pci_device_id *dev_id) | |
2334 | { | |
2335 | struct Scsi_Host *host; | |
2336 | struct cxlflash_cfg *cfg = NULL; | |
88d33628 | 2337 | struct device *dev = &pdev->dev; |
c21e0bbf MO |
2338 | struct dev_dependent_vals *ddv; |
2339 | int rc = 0; | |
2340 | ||
2341 | dev_dbg(&pdev->dev, "%s: Found CXLFLASH with IRQ: %d\n", | |
2342 | __func__, pdev->irq); | |
2343 | ||
2344 | ddv = (struct dev_dependent_vals *)dev_id->driver_data; | |
2345 | driver_template.max_sectors = ddv->max_sectors; | |
2346 | ||
2347 | host = scsi_host_alloc(&driver_template, sizeof(struct cxlflash_cfg)); | |
2348 | if (!host) { | |
88d33628 | 2349 | dev_err(dev, "%s: scsi_host_alloc failed\n", __func__); |
c21e0bbf MO |
2350 | rc = -ENOMEM; |
2351 | goto out; | |
2352 | } | |
2353 | ||
2354 | host->max_id = CXLFLASH_MAX_NUM_TARGETS_PER_BUS; | |
2355 | host->max_lun = CXLFLASH_MAX_NUM_LUNS_PER_TARGET; | |
2356 | host->max_channel = NUM_FC_PORTS - 1; | |
2357 | host->unique_id = host->host_no; | |
2358 | host->max_cmd_len = CXLFLASH_MAX_CDB_LEN; | |
2359 | ||
88d33628 | 2360 | cfg = shost_priv(host); |
c21e0bbf MO |
2361 | cfg->host = host; |
2362 | rc = alloc_mem(cfg); | |
2363 | if (rc) { | |
88d33628 | 2364 | dev_err(dev, "%s: alloc_mem failed\n", __func__); |
c21e0bbf | 2365 | rc = -ENOMEM; |
8b5b1e87 | 2366 | scsi_host_put(cfg->host); |
c21e0bbf MO |
2367 | goto out; |
2368 | } | |
2369 | ||
2370 | cfg->init_state = INIT_STATE_NONE; | |
2371 | cfg->dev = pdev; | |
17ead26f | 2372 | cfg->cxl_fops = cxlflash_cxl_fops; |
2cb79266 MO |
2373 | |
2374 | /* | |
2375 | * The promoted LUNs move to the top of the LUN table. The rest stay | |
2376 | * on the bottom half. The bottom half grows from the end | |
2377 | * (index = 255), whereas the top half grows from the beginning | |
2378 | * (index = 0). | |
2379 | */ | |
2380 | cfg->promote_lun_index = 0; | |
2381 | cfg->last_lun_index[0] = CXLFLASH_NUM_VLUNS/2 - 1; | |
2382 | cfg->last_lun_index[1] = CXLFLASH_NUM_VLUNS/2 - 1; | |
2383 | ||
c21e0bbf | 2384 | cfg->dev_id = (struct pci_device_id *)dev_id; |
c21e0bbf MO |
2385 | |
2386 | init_waitqueue_head(&cfg->tmf_waitq); | |
439e85c1 | 2387 | init_waitqueue_head(&cfg->reset_waitq); |
c21e0bbf MO |
2388 | |
2389 | INIT_WORK(&cfg->work_q, cxlflash_worker_thread); | |
2390 | cfg->lr_state = LINK_RESET_INVALID; | |
2391 | cfg->lr_port = -1; | |
0d73122c | 2392 | spin_lock_init(&cfg->tmf_slock); |
65be2c79 MO |
2393 | mutex_init(&cfg->ctx_tbl_list_mutex); |
2394 | mutex_init(&cfg->ctx_recovery_mutex); | |
0a27ae51 | 2395 | init_rwsem(&cfg->ioctl_rwsem); |
65be2c79 MO |
2396 | INIT_LIST_HEAD(&cfg->ctx_err_recovery); |
2397 | INIT_LIST_HEAD(&cfg->lluns); | |
c21e0bbf MO |
2398 | |
2399 | pci_set_drvdata(pdev, cfg); | |
2400 | ||
c21e0bbf MO |
2401 | cfg->cxl_afu = cxl_pci_to_afu(pdev); |
2402 | ||
2403 | rc = init_pci(cfg); | |
2404 | if (rc) { | |
88d33628 | 2405 | dev_err(dev, "%s: init_pci failed rc=%d\n", __func__, rc); |
c21e0bbf MO |
2406 | goto out_remove; |
2407 | } | |
2408 | cfg->init_state = INIT_STATE_PCI; | |
2409 | ||
2410 | rc = init_afu(cfg); | |
2411 | if (rc) { | |
88d33628 | 2412 | dev_err(dev, "%s: init_afu failed rc=%d\n", __func__, rc); |
c21e0bbf MO |
2413 | goto out_remove; |
2414 | } | |
2415 | cfg->init_state = INIT_STATE_AFU; | |
2416 | ||
c21e0bbf MO |
2417 | rc = init_scsi(cfg); |
2418 | if (rc) { | |
88d33628 | 2419 | dev_err(dev, "%s: init_scsi failed rc=%d\n", __func__, rc); |
c21e0bbf MO |
2420 | goto out_remove; |
2421 | } | |
2422 | cfg->init_state = INIT_STATE_SCSI; | |
2423 | ||
2424 | out: | |
88d33628 | 2425 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
2426 | return rc; |
2427 | ||
2428 | out_remove: | |
2429 | cxlflash_remove(pdev); | |
2430 | goto out; | |
2431 | } | |
2432 | ||
5cdac81a MO |
2433 | /** |
2434 | * cxlflash_pci_error_detected() - called when a PCI error is detected | |
2435 | * @pdev: PCI device struct. | |
2436 | * @state: PCI channel state. | |
2437 | * | |
1d3324c3 MO |
2438 | * When an EEH occurs during an active reset, wait until the reset is |
2439 | * complete and then take action based upon the device state. | |
2440 | * | |
5cdac81a MO |
2441 | * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT |
2442 | */ | |
2443 | static pci_ers_result_t cxlflash_pci_error_detected(struct pci_dev *pdev, | |
2444 | pci_channel_state_t state) | |
2445 | { | |
65be2c79 | 2446 | int rc = 0; |
5cdac81a MO |
2447 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); |
2448 | struct device *dev = &cfg->dev->dev; | |
2449 | ||
2450 | dev_dbg(dev, "%s: pdev=%p state=%u\n", __func__, pdev, state); | |
2451 | ||
2452 | switch (state) { | |
2453 | case pci_channel_io_frozen: | |
1d3324c3 MO |
2454 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); |
2455 | if (cfg->state == STATE_FAILTERM) | |
2456 | return PCI_ERS_RESULT_DISCONNECT; | |
2457 | ||
439e85c1 | 2458 | cfg->state = STATE_RESET; |
5cdac81a | 2459 | scsi_block_requests(cfg->host); |
0a27ae51 | 2460 | drain_ioctls(cfg); |
65be2c79 MO |
2461 | rc = cxlflash_mark_contexts_error(cfg); |
2462 | if (unlikely(rc)) | |
88d33628 | 2463 | dev_err(dev, "%s: Failed to mark user contexts rc=%d\n", |
65be2c79 | 2464 | __func__, rc); |
9526f360 | 2465 | term_afu(cfg); |
5cdac81a MO |
2466 | return PCI_ERS_RESULT_NEED_RESET; |
2467 | case pci_channel_io_perm_failure: | |
2468 | cfg->state = STATE_FAILTERM; | |
439e85c1 | 2469 | wake_up_all(&cfg->reset_waitq); |
5cdac81a MO |
2470 | scsi_unblock_requests(cfg->host); |
2471 | return PCI_ERS_RESULT_DISCONNECT; | |
2472 | default: | |
2473 | break; | |
2474 | } | |
2475 | return PCI_ERS_RESULT_NEED_RESET; | |
2476 | } | |
2477 | ||
2478 | /** | |
2479 | * cxlflash_pci_slot_reset() - called when PCI slot has been reset | |
2480 | * @pdev: PCI device struct. | |
2481 | * | |
2482 | * This routine is called by the pci error recovery code after the PCI | |
2483 | * slot has been reset, just before we should resume normal operations. | |
2484 | * | |
2485 | * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT | |
2486 | */ | |
2487 | static pci_ers_result_t cxlflash_pci_slot_reset(struct pci_dev *pdev) | |
2488 | { | |
2489 | int rc = 0; | |
2490 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
2491 | struct device *dev = &cfg->dev->dev; | |
2492 | ||
2493 | dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); | |
2494 | ||
2495 | rc = init_afu(cfg); | |
2496 | if (unlikely(rc)) { | |
88d33628 | 2497 | dev_err(dev, "%s: EEH recovery failed rc=%d\n", __func__, rc); |
5cdac81a MO |
2498 | return PCI_ERS_RESULT_DISCONNECT; |
2499 | } | |
2500 | ||
2501 | return PCI_ERS_RESULT_RECOVERED; | |
2502 | } | |
2503 | ||
2504 | /** | |
2505 | * cxlflash_pci_resume() - called when normal operation can resume | |
2506 | * @pdev: PCI device struct | |
2507 | */ | |
2508 | static void cxlflash_pci_resume(struct pci_dev *pdev) | |
2509 | { | |
2510 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
2511 | struct device *dev = &cfg->dev->dev; | |
2512 | ||
2513 | dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); | |
2514 | ||
2515 | cfg->state = STATE_NORMAL; | |
439e85c1 | 2516 | wake_up_all(&cfg->reset_waitq); |
5cdac81a MO |
2517 | scsi_unblock_requests(cfg->host); |
2518 | } | |
2519 | ||
2520 | static const struct pci_error_handlers cxlflash_err_handler = { | |
2521 | .error_detected = cxlflash_pci_error_detected, | |
2522 | .slot_reset = cxlflash_pci_slot_reset, | |
2523 | .resume = cxlflash_pci_resume, | |
2524 | }; | |
2525 | ||
c21e0bbf MO |
2526 | /* |
2527 | * PCI device structure | |
2528 | */ | |
2529 | static struct pci_driver cxlflash_driver = { | |
2530 | .name = CXLFLASH_NAME, | |
2531 | .id_table = cxlflash_pci_table, | |
2532 | .probe = cxlflash_probe, | |
2533 | .remove = cxlflash_remove, | |
babf985d | 2534 | .shutdown = cxlflash_remove, |
5cdac81a | 2535 | .err_handler = &cxlflash_err_handler, |
c21e0bbf MO |
2536 | }; |
2537 | ||
2538 | /** | |
2539 | * init_cxlflash() - module entry point | |
2540 | * | |
1284fb0c | 2541 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
2542 | */ |
2543 | static int __init init_cxlflash(void) | |
2544 | { | |
65be2c79 MO |
2545 | cxlflash_list_init(); |
2546 | ||
c21e0bbf MO |
2547 | return pci_register_driver(&cxlflash_driver); |
2548 | } | |
2549 | ||
2550 | /** | |
2551 | * exit_cxlflash() - module exit point | |
2552 | */ | |
2553 | static void __exit exit_cxlflash(void) | |
2554 | { | |
65be2c79 MO |
2555 | cxlflash_term_global_luns(); |
2556 | cxlflash_free_errpage(); | |
2557 | ||
c21e0bbf MO |
2558 | pci_unregister_driver(&cxlflash_driver); |
2559 | } | |
2560 | ||
2561 | module_init(init_cxlflash); | |
2562 | module_exit(exit_cxlflash); |